### Brain Teasers

# Sequencing the Stone...

A group of stones are all lined up. Upon closer inspection, you realize there are numbers on the stones, as follows:

1 - 2 - 3 - 5 - 9 - 12

The last stone has had its number worn off by wind and time, what should the number on the stone read?

1 - 2 - 3 - 5 - 9 - 12

The last stone has had its number worn off by wind and time, what should the number on the stone read?

### Hint

This is a logical sequence, not necessarily a mathematical one.### Answer

21one - two - three - five - nine - twelve - twenty-one

The words for the numbers end in vowels.

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## Comments

i didn't get you

I love logic teasers! I actually got this one, but it took me quite a bit of time. I refused to look at the hint until I thought I knew it and I got it right! Great job on this!

dude, good job but maybe it would've helped a bit if you tell them that it's not mathmatical, even though it's not in the math section.

I didn't get this one.. but it was still cool! I liked it, I just didn't think about spelling out the words...

I put in for a correction on this one. The correct answer would be Twenty, When "y" is used at the end of a word it is considered a vowel.

Oct 10, 2005

Another way to look at it is: 1+2=3, 3+5=9, and so 9+12=21!

I don't get why it can't be any number that ends in a vowel then. Why is it just twenty-one?

and 3+5=8 for the record...not 9

and 3+5=8 for the record...not 9

good teaser. It is both a logical sequence and mathematical. I was able to figure out hint isnt really necessary. turns out for the one you came up with is both logical and mathematical for up to 21. Still good. In case your wondering the secuence is 1+ 1= 2

2+1 (or 1 squared)= 3

3+2 = 5

5+4 (or 2 squared) =9

9 + 3 = 12

and then 12+ 9 (or 3 squared)= 21

2+1 (or 1 squared)= 3

3+2 = 5

5+4 (or 2 squared) =9

9 + 3 = 12

and then 12+ 9 (or 3 squared)= 21

Ah nice find scottyvo

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