exam Maths Puzzle Numerical Ability

Given 2p-x=50 and p=8000/(x+370), how can you find x?

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exam Other Question

Using a financial calculator, input N = 4, I = 8, PV = 0, FV = 1259.71, and PMT = ?
Solve for PMT $279.56. Therefore, you would have to make 4 payments of $279.56
each to have The polynomial 1600x^3+1200x^2+800x represents your savings, with interest, from a summer job after three years. The annual interest rate equals x-1. Find the interest needed so that you will have $4000 at the end of three years.