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Question

The width of a rectangle is two-thirds its length. If the perimeter is 180 metres, find the dimensions of the rectangle.

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Solution

Let the width of the rectangle be x cm.It is 23 of the length of the rectangle.This means that the length of the rectangle will be 32 x.Perimeter of the rectangle = 2(x) + 2(32)x = 180 m 2x + 6x2 = 180 4x + 6x2 = 180 (taking the L.C.M. of 1 on the L.H.S. of the equation) 10x = 2 × 180 (by cross multiplication) 10x = 360 x = 36010= 36Therefore, the width of the rectangle is 36 m.Length of the rectangle will be = 32x = 32( 36 )= 54 m

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