exam Maths Puzzle Numerical Ability

How do I solve by using a system of two equations in two variables?

Five years ago, Tom was one third as old as his father was then. In 5 years, Tom will be half as old as his father will be then. Find their ages now.

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I was asked to solve a proof with the following components:

Given: ABCD is a parallelogram
segment AT is perpendicular to segment BD, and segment CQ is perpendicular to segment 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