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Brain Teasers and Puzzles 



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Puzzle 685 



In my money box, I found $36.80 made up of equal numbers of quarters, dimes, and nickels.

How many of each coin did I find?

Puzzle Copyright © Kevin Stone

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Puzzle 686 



What number comes next in the sequence:

11  13  17  31  37  71  73  79  97  {?}

Puzzle Copyright © Kevin Stone

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Puzzle 687 



How much soil is there...

...in a circular hole 2 metres deep and 1 metre across?

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Puzzle 688 



What is the smallest integer, which, when multiplied by 7 gives a number consisting of only 4's?

Puzzle Copyright © Kevin Stone

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