exam Maths Puzzle Numerical Ability

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.

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exam Other Question
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) Is 4 or -1 a root of the equation ysquared-3y=4?