### Brain Teasers

# 100, 81, 64, 49, ...

Fill in the blank: 100, 81, 64, 49, ... ?

### Answer

36.These are all squares, 10x10, 9x9, 8x8, 7x7, we are looking for 6x6.

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## Comments

Jan 01, 2006

I saw this teaser differently. I subtracted 81 from 100 and got 19. I then did the same with 64 and 81 and got 17. I noticed a difference of two between the numbers. I then tried subtracting 15 from 64 and to no surprise, I got 49. Figuring this must be the pattern, I subtracted 13 from 49 which gave me 36.

Good one. I must admit it took much longer the way I did it, but it was nontheless relatively easy.

Good one. I must admit it took much longer the way I did it, but it was nontheless relatively easy.

too obvious

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