book Maths Puzzle Numerical Ability

(2x+7)(x^(2-9)); x=?

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book Other Question

William is 1/6 as old as his father but 5 years older than his sister, Mary. If the sum of all their ages is 51, how old is William?

(not from a text) Thank You for your help. i need help in solving these questions, i do not understand them.