exam Maths Puzzle Numerical Ability

Find the coordinates of the midpoint of a segment with the given endpoints:
P(-12,4)Q (-3,-6)

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exam Other Question

I am stuck on correct answer for:

if the width of a rectangle is one-third of its length and its length is 12, what is the area of the rectangle?

I am not using any specific book. I am just practicing.. need to solve for Y, (x-2)/(x+1)=(5y+1)/(y-2)