exam Maths Puzzle Numerical Ability

How do you solve x/5x+25 - 5/x^2+5x

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exam Other Question

A chemist mixed some 15% peroxide solution ith some 6% peroxide solution to make 300 ML of a 9% peroxide solution. How many milliliters of the 15% solution was used?
Find the polynominal f(x) of degree three that has zeros at 1,2 and 4 such that f(0)=-16.