Last week’s answer: Each of the other two sides is 60m long. This is because we know that the two sides sum to 200m – 80m = 120m, and therefore if they are the same size then they must both be 120m / 2 = 60m.
This week’s Problem: Harry buys 6 lemons at 60p each. If he pays with a £5 note, how much change will he get?
The answer will be in next week’s Weekly Problem.