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More ways to get Braingle...

How Old is ____? #2

Math brain teasers require computations to solve.

 

Puzzle ID:#43594
Fun:** (1.92)
Difficulty:* (0.55)
Category:Math
Submitted By:angelsluvmeAus****!
Corrected By:math12

 

 

 



Jane is 34. Kevin is 11. Lucy is half as old as Jane but three years younger than Mike. Mike is 3 times as old as Greg. How old is Greg?

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Comments

markmonninAus*
Nov 25, 2008

Fun and easy .
adam213Aus*
Nov 25, 2008

Questions like this always turn up on standardized tests. It's good to know how to tackle them.
W1nd
Nov 25, 2008

aw i was so close, i got 6.6666...
Malika123tph*
Nov 27, 2008

Me too, I got 6.66666666666.
ZingerAus*
Nov 28, 2008

yea that wasnt too bad i got 6.6666666666
stil*us*
Nov 28, 2008

Your casual flip-flop has a foul odor. Even age ambitious toddlers do not claim decimal ages. At most they count quarter years after their parents quit counting months.
Moreover, six-years-and-eight-months is an exact answer to squirrelled question.
pating**
Dec 03, 2008

If Greg is Six-years-and-eight-months old, Mike would be "exactly" 20 years old, Lucy is "exactly" 17 years old, and Jane "exactly" 34 years old. Does that mean Jane, Lucy and Mike share the same birthday, and today is their birthday?

Just wondering...
mreyAmx
Jan 31, 2009

just want to know how to type the answer? liked the teaser
Quickq*en*
Feb 21, 2009

How does giving us kevins age help, and why is the answer 6.7? 6.666666 is the right answer. And if you think that 6.666666 is wrong because it isn't right down to the last nanosecond, what's wrong with 6 2/3?

2/10 for that teaser.
jae113
Mar 05, 2009

Can someone please explain how this is done?

Here is what I did, but I can't get the right answer:

J=34
K=11
L= 34/2, which is 17
M=L+3, which is 20
G= M*3, which is 60!
MagaJambakr*
Mar 09, 2009

Jae i did the same thing and all the people that got 6.66 with a bar notation u gotta round simple as that...
pating**
Mar 10, 2009

jae, its M=3*G. So 20=3*G. And G=20/3.
PaladinAus*
Apr 09, 2009

You did it correctly up to "Mike is 3 times as old as Greg"

You got Mike = 20, but then you said Greg = 20 *3 which would have been "Greg is 3 times as old as Mike"

Instead, Greg = 20/3 = 6 2/3
aliceedwardstau*
Jul 09, 2011

A very fun teaser.



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