BrainBashers - Brain Teasers and Puzzles

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?

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Puzzle 686

What number comes next in the sequence:

11 13 17 31 37 71 73 79 97 ?

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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 positive integer which, when multiplied by 7, gives an answer consisting of only 4's?

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