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Hint: How much of a program does Matthew write in one day?

Answer: 4 days.

In one day Steve can write 1/20 of a program, John and Kev can both write 1/10.

So in one day, in total, they can write 1/20 + 1/10 + 1/10 = 1/4.

Therefore a program will take 4 days. QED.

Puzzle 4

Using only horizontal and vertical lines, connect every number to its pair (i.e. 1 goes to 1, 2 goes to 2, etc). The lines must not cross each other. This puzzle is not interactive, but can be printed off and solved.

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