book Maths Puzzle Numerical Ability

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(3x^2)(7x^2)

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cubedroot3(sqrt81x^4y^8

A)9x^2y^4
B)3xy^2 (sqrt3xy^2)
C)9xy^2 Find two positive integers whose sum is 48, and whose sum also equals twice their difference. What is the smaller and lager integer?