### Brain Teasers

# Why Skid Mark Why? Part 2

When Question Mark unlocked the door, he thought that he would see his wallet straight away. But Skid Mark (Question's brother) decided to put the wallet in a safe. The combination is three 2-digit numbers which can be expressed like this:

xx-xx-xx

You are given the following clues to work out the combination:

The total of the three numbers is 39.

The second number is half of the third number.

The first number is the third number minus 1.

Can you find Question's wallet in time? It's all up to you.

xx-xx-xx

You are given the following clues to work out the combination:

The total of the three numbers is 39.

The second number is half of the third number.

The first number is the third number minus 1.

Can you find Question's wallet in time? It's all up to you.

### Answer

The combination is 15-08-16. Thank you for helping Question get his wallet back.Hide Answer Show Answer

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## Comments

Jul 20, 2005

Its very complicated, men!

That was a good one.

It makes you think.

It makes you think.

sorry, it said half of 3rd number, i thought it said 1st

loved it - a little tricky too

This was a good one!

my brain hurts

I liked it. It was good.

Jul 28, 2005

Very Good !! I have to add this as one of my favorites !

Akg, somehow you saying it was 'gay' made me laugh . I don't know why.

Simple and fun = ). I don't know how that other person got 7.5 though...Whatever, I thought it was nice. = ).

hurrah skid mark!!

I got it right!!!!

I got it right!!!!

Aug 10, 2005

wow that was a good one!!!! it really made me think a lot!!!!

Who names a kid Question Mark?

Lot's of fun .. a little brain exercise .. and your story entertains .. a great combination for a Bringle puzzle! ?=

it makes your brain works.....but i solve it with differnt version

7 + (4 x

7 + 32 = 39

first# third# munis 1 8-1 = 7

second# half of 8 is 4

third# is 8

ans: 7 4 8

7 + (4 x

7 + 32 = 39

first# third# munis 1 8-1 = 7

second# half of 8 is 4

third# is 8

ans: 7 4 8

oppsss....i typo error should be minus instead of munis......

7 + (4x

7 + 32 = 39

ans: 748

first# = third# minus 1 (8-1) = 7

second# = half of 8 is 4

third# is 8

sounds logical

7 + (4x

7 + 32 = 39

ans: 748

first# = third# minus 1 (8-1) = 7

second# = half of 8 is 4

third# is 8

sounds logical

Ok, 15 doesn't have an even 1/2, and what is wrong w/ 20 10 & 9, not neccesarily in that order? If 7.5 was a # I'd a been mo5re entertained...

Wait! maybe I read it backwards!

Sorry, I thought it was pretty easy. Clever, though.

Guys, "skid mark" has a pretty gross meaning in the UK. Suffice to say, it's not a mark made on a road, but inside your underwear...

I didn't mean to make it that way. Although I do live in the UK so I know.

Aside from all these tire (re)marks, I thought it was a fun teaser. I just used odd# + even# + even#, per the instructions, until they added up to 39. Simple!

Very easy if you know algebra.

This one was a good one. I had some trouble with it but got it. Good Job!

Exclamation Mark must be involved because, when I opened the safe the wallet wasn't there.

What are those three stooges going to do, anyways?(asked question mark)

What are those three stooges going to do, anyways?(asked question mark)

My 7th grade algebra teacher would be very disappointed in me...good teaser!

That was easy. (z-1) + 1/2 z + z = 39.

Robin, everyone knows what skid mark means, not just in the UK. And some of us find it rather amusing. Thank you, Question, that was certainly a flashback to Algebra class. And I thought I wouldn't need algebra in real life. This is real life, isn't it?

good one

that was fun! i like ones that have to do with math

I used the same formula as agdjenn - and got the answer. A great refresher for those of us who have been out of school for a (long) while... and a reminder that things you learn there DO come in handy! Great teaser!!!

Here is a good example of when algebra is useful...great job, and cool names and good idea for a continuation of your previous riddle!

Having just finished with algebra this year, this was extremely easy.

i got this one! this was easy! keep em' coming

The numbers 0 through 9 are single digit numbers ... they belong in the 'ones column', therefore, "08" is not a valid 2-digit number.

That being the case, 10 is the lowest 2-digit number, and following your equation, 49 would be the correct sum of three 2-digit numbers, which are 19-10-20.

I do like the creativity of your characters' names.

That being the case, 10 is the lowest 2-digit number, and following your equation, 49 would be the correct sum of three 2-digit numbers, which are 19-10-20.

I do like the creativity of your characters' names.

This was a very simple yet fun teaser. My one comment is that 08, though it may be written with two digits, is still a one digit number. I thought the teaser was good anyway

I think it was really stupid.

That was a great teaser, and algebra really came in handy. The thing is, I always like to do it my way, not the way the formula say! Keep em comin! Good job!

Tricky, but nice!!

came up with an an answer right away but I knew that 7.5 was not a "real" number to use on a combination lock. I tweaked the numbers just a little and came up with the solution.

Tricky, but nice!!

Always enjoy the opportunity to set up a simple algebraic equation:

(x-1) + 1/2x + x = 39. Familiar but fun. Thought it might have been better placed in the math category rather than logic.

(x-1) + 1/2x + x = 39. Familiar but fun. Thought it might have been better placed in the math category rather than logic.

I didn't use that equation. I used 39=2x+2x+x-1

I love the feel of Algebra coursing hot rivulets of mathematical non-compliance through my brain. This is a ninth grade word problem...

Fun, but not overly difficult.

Fun, but not overly difficult.

Great teaser Q Mark! I really enjoyed it (mainly because I got the right answer).

BTW- I second Mogur's comment.

BTW- I second Mogur's comment.

Good one,enjoyed it.

i actually liked this one this one really make sense, unlike some that i have seen

This is good, it makes sense, it works the brain... it is really great!

i liked, but i kept on thinking that i was getting it wrong, because i did 8 as one digit, not two. oops!

but it was a good one!

but it was a good one!

1 word. STUPID!

works better(all solutions are two digit) if sum of three is 49.

WA-HOO! I HELPED QUESTION MARK GET HIS WALLET BACK JUST BY READING THE ANSWER! IT WAS JUST THAT EASY!

YaY!! i got it!! i had a problem sort of like this one on my algebra homework last night!

Thought it was easy..but good teaser...wtg...keep them coming..I like easy, sometimes my brain isn't too sharp

Aaaaaaarrrrrrrrhhhhh!!!!!!!

I THOUGHT IT WAS BORING AND STUPID. I ALSO THRID MOGUR'S COMMENT!!!

I SO think you were cheating to consider the number 8 to be a TWO-digit number!!!

I did not get that one. I couldn't understand how to set up the equation.

I learned solving systems a few years back, 7th grade.. didnt think I'd use this in the real world too much... but I found a use for it!!

that was great, Love these kind! thanks Queston Mark

these 2 puzzzles kept me ansd my friends busy for 10 mins. thanks

That was fun! It was very easy...for me. But, why wasn't it in the math section?

Nice! I liked it! I did why skidmark why #1 as well! They were both very fun! Challengeing but not too much so!

Great teaser!

Not too difficult, not too easy and lots of fun.

Not too difficult, not too easy and lots of fun.

8 is NOT a two-digit number!!!!

Aside from that, it was a good teaser.

One question though...what did he need to find his wallet in time for?

Aside from that, it was a good teaser.

One question though...what did he need to find his wallet in time for?

I came up with the right answer but questioned myself because I also said 8 was a ond digit number,but I couldn't come up with another solution.

one not ond

My! That was very easy! Basic Algebra.

And yeah, '08' still qualifies as a two-digit number as far as safes are concerned.

And yeah, '08' still qualifies as a two-digit number as far as safes are concerned.

'08' would be imposible if the safe has no zero. Common sense! What's with the hooplah?

Aug 22, 2008

This was simple and it angered me that you call 8 a two digit number.

It was pretty good. I solved it by estimating how much a 1/5 is of 39. I just don't think 8 is really a 2-digit nimber.

Sorry, I meant "number"

But on a safe, the numbers are fixed.

Slot1 Slot2 Slot3 Slot4 Slot5 Slot6

So there are six tumblers and each tumbler must have a digit even if that number is zero.

So, on a safe that already has the tumblers in place, 8 IS a two digit number entered on the tumblers as 08

Slot1 Slot2 Slot3 Slot4 Slot5 Slot6

So there are six tumblers and each tumbler must have a digit even if that number is zero.

So, on a safe that already has the tumblers in place, 8 IS a two digit number entered on the tumblers as 08

Too easy with algebra, but still nice!

I'm not fond of this type of teaser. Guess you can say I'm not logical.

Thanks for posting, however.

Thanks for posting, however.

I love logic as much as I love algebra, but I too thought 8 was not a 2 digit number. But I stuck with my answer and I was right.

That was fun! I got it in two minutes. I figured that since the middle number was half of the amount of the third & first numbers, it represented 1 part and the first & third numbers each represented 2 parts equalling 5 parts. Divide that into 39 (basically 40) and that leaves the middle number at 8 and the other two were easy to figure out from there. This sounded a lot more complicated than it was.

I loved this one! and I was happy that I figured it out. I was determined that I was going to find the correct answer and not quit until I did! Because math equations are not my thing. HUGS to KiPA and AS!

Doehead, who cares if this is AROB - it's been 3 years! It's a first for me!

Gee Gayle I haven't even said it was AROB. But whatever you want to call it. It is still AROB. But I still Think your great.

I solved it along Carolyn's methods - logically; no algebra involved. The third number had to be even (in order to be halved), and had to fall between 14-18 (1/3 to 1/2 of 39 - anything else would be too small or too great to work based on the given clues).

14 didn't work, but 16 was magic. Fun teaser.

14 didn't work, but 16 was magic. Fun teaser.

I'm with Carolyn and Rockstar. I was relatively easy, but fun!

I'm with Carolyn and Rockstar. I was relatively easy, but fun!

Yes , easy but fun. I still got hung up on 8 being a 2 digit #.

This was even better then part 1! i used algebra too, that did make it very easy.

Well, what I got was 19 7 13 It still adds up to 39. Shouldn't the author tell us how she got the answer? I did math also and got my answer. HMMM!

Babe, 7 isn't half of 13, and 19 isn't 1 less than 13. even though your numbers add up to 39, they're not the correct answers. Hopefully tomorrow's quiz won't be about math or logic!

I also followed rockstar1009's method to arrive at the answer. The question was fairly easy, but somehow seemed more like a math test than a teaser.

This was a yawn for me. Very basic!!!

It was kind of easy in that it didn't take a lot of math knowledge or overly complicated. For me it was trial and error of the even #'s from 10 up in my head until I hit the right number for the sequence. I liked it a lot!

Oh dear. It's just as well you don't know what 'Skid Mark' means in England!

This is why I was never good at word problems back in school. I got the answer just fine, but some of these formulas you are commenting are just, wow - how do you think in terms of formulas?

I knew that the answers had to be below 19 because all three had to fit the criteria. Then I started with 5 and 10 and found 24 to be the leftover. That's obviously not 1 below 10. So I did 7 and 14 and added 13, but it didn't add up to 39

Finally got 8 and 16 then added 15 and it worked perfect.

No formula...

I knew that the answers had to be below 19 because all three had to fit the criteria. Then I started with 5 and 10 and found 24 to be the leftover. That's obviously not 1 below 10. So I did 7 and 14 and added 13, but it didn't add up to 39

Finally got 8 and 16 then added 15 and it worked perfect.

No formula...

I was not able to get this one; the instructions were not very clear that a two digit number could include single digit numbers with a zero in front of them.

Got it right!

So that I didn't have to keep manually checking my arithematic, I set up a little Google Sheet, adding functions for the three equations:

#1 + #2 + #3 = 39

#3/2 = #2

#1 = #3 -1

I started my guess with an estimate that the answers were about in fifths of the total:

#1 was 2 parts

#3 was 2 parts

and #2 was 1 part (half of #3)

From there, I plugged in initial values of 16, 8, and 16 and since I knew that #1 was #3 minus 1, I tried 15 and saw that 15, 8, and 16 satisfied each of the provided equations!

Fun, thanks!

#1 + #2 + #3 = 39

#3/2 = #2

#1 = #3 -1

I started my guess with an estimate that the answers were about in fifths of the total:

#1 was 2 parts

#3 was 2 parts

and #2 was 1 part (half of #3)

From there, I plugged in initial values of 16, 8, and 16 and since I knew that #1 was #3 minus 1, I tried 15 and saw that 15, 8, and 16 satisfied each of the provided equations!

Fun, thanks!

No need for algebra; only took 2 guesses to get it right?

Fun, easy and entertaining teaser; this time I got it right away.

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