exam Maths Puzzle Numerical Ability

please help to simplify

2x^2/a + a

DIVIDED by

y^2/a - 3a

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exam Other Question

Divide
x^2+2x-15/4x^2 divided by x^2-25/2x-10

Thanks an account has money in three accounts that pay 6%,9%, 14% in annual interest. he has twice as much invested at 6% as he does at 9% and three times much invested at 14% as he does