exam Maths Puzzle Numerical Ability

Problem

A boxing ring is in the shape of a square 20ft on each side. How far apart are the firefighters when thay are in opposite corners of the ring?

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exam Other Question

This is from a worksheet: In a chemistry class, 6 liters of a 4% silver iodide solution must be mixed with a 10% solution to get a 6% solution. How many liters of the 10% solution is needed? A woman is chosen at random among all women who have two children. She is asked if she has at least one son and answers yes. What is the probability that her other child is a boy?