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

g/17=5 Seattle Star blends whole bean coffee worth $0.93 per pound with half bean coffee worth $1.20 per pound to get 30 pounds of a coffee blend worth $1.02 per pound. How many pounds of each type of coffee does she use?