if the ratio of the length to the breadth of a rectangle B5 ratio 3 and its perimeter is 144 M find the length of a rectangle
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Let the ratio be 5x:3x.
Perimeter= 144
2(l + b)=144
2(5x + 3x)=144
8x=72
x=9
length=5 x 9= 45cm
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