exam Maths Puzzle Numerical Ability

A chemist needs 130 milliliters of a 65% solution but has only 56% and 95% solutions available. Find how many millimeters of each that should be mixed to get the desired solution.

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exam Other Question

I need to find the zeros of the 4th degree expression,
so I may know the x-intercepts. This is needed by factoring

Problem: x^4 - x^3 - 4x^2 + 2x + 4

My solution: x^2(x^2 - Solve and check for x

x/x-2 - x+1/x = 8/x^2-2x