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Introduction to Ratio

If the ratio ...

Question

If the ratio of the length to the breadth of a rectangle be 5:3 and its perimeter is 144 m. Find the length of the rectangle?

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Solution

Let the length be 5x and breadth be 3x
Since perimeter =2(l+b)
we have
144=2(5x+3x)
144=2(8x)
144/2=8x
72=8x
Therefore x=72/8
X=9
Therefore
Length=5x=59=45m

Breadth=3x=39=27m

Therefore length of rectangle =45m

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