book Maths Puzzle Numerical Ability

the mesures of two complementary angles are represented by x+5 and 4x-15 find the value of x

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My algebra problem is: TC=1600+120Q-0.4Q^2-0.002Q^3; Q=1200-4P. I know how to substitute Q=1200-4P for Q in the first problem, however I have forgotten how to solve the equation w What does M equal in algebra ?