It was estimated that about £125 per second was raised during a TV show charity evening. How much money was raised when the programme was on air from 7pm to 11pm?
The 7puzzle Challenge
The playing board of the 7puzzle game is a 7-by-7 grid of 49 different numbers, ranging from 2 up to 84.
The 2nd & 3rd rows contain the following fourteen numbers:
8 13 17 25 28 36 42 45 48 55 63 64 66 80
Which number, when 20 is added to it, becomes a square number?
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