book Maths Puzzle Numerical Ability

a rectangular picture is 12 by 16 inches. if a frame of uniform width contains an area of 165 square inches, what is the width of the frame.

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book Other Question

Suppose C=(2,8,9), D=(4,8,12), and E=(6,8,9).
a. Find (C union D)intersection E b.Find C union(d intersection E)
I need to find the common denominator in this formula:


6/4x squared times 2/5x