exam Maths Puzzle Numerical Ability

Can you solve the below equation for r. In others words have r = everything else.

V = (C/r)(1-(1/(1+r)^T))+(F/(1+r)^T)

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exam Other Question

Two angles are complementary. The sum of the measure of the first angle and one-fourth the second angle is 60.75. What is the measure of the smaller angle & what is the measure of this is a story problem. "A rectangle whose perimeter is 192 is 3 times as long as it is wide. Find the dimensions and area." Can you please help me.