book Maths Puzzle Numerical Ability

explain why function y=x square has no inverse.suggest how many inverse can you
define for it

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book Other Question

The sum of two consecutive integers is 43. Mr. Jones is 4 years older than his wife and 31 years older than his son. their ages add up to a total of 82 years. Find how old Mr. Jones is and the ages of his wife and son.