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Mathematical Puzzles 



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Puzzle 37 



If

 7/28 of 64 is 16 and

 9/12 of 100 is 75 and

 3/9 of 33 is 11

what is 5/15 of 45?

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Puzzle 38 



After a day picking strawberries I had a basket full.

I ate 5 and gave Alex half of the remaining.

I then ate another 3 and gave Billie one third of the remaining.

I ate another 6 and then gave Charlie two thirds of the remaining.

I now had 34 strawberries left. How many did I start with?

Puzzle Copyright © Kevin Stone

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Puzzle 39 



You have a very large number of generic plastic building blocks, each in the shape of a cube.

Think about how many cubes you would need in order to construct a giant cube with 16 small cubes along each edge.

If you were to then remove the outside layer, how many small cubes would you have removed?

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Puzzle 40 



Which square, which circle, and which triangle has the closest area to the doughnut shape on the left?

The drawings are to scale, so you might be able to judge it, as well as working the actual areas out.

Doughnut And Shapes

Puzzle Copyright © Kevin Stone

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