exam Maths Puzzle Numerical Ability

I do not know how to do this problem at all as well as all the others!!!!!!

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exam Other Question

Given A = [3 -2]
1 4

and B = [-1 5
2 3]

, find find 2A - 3B. The length of a rectangle is three times the width. The area is 108 cm squared. Find the dimensions of the rectangle.