The ratio between the perimeter and the breadth of a rectangle is 5 : 1 . If the area of the rectangle is 216 sq.cm. . what is the length of the rectangle ?
`(2(l + b))/(b) = 5 : 1 `
`rArr 2l + 2b = 5b`
`rArr 3b = 2l`
`rArr b = 2/3 l.`
Then , area = 216`cm^2`
`rArr l xx b = 216`
`rArr l xx 2/3 l= 216`
`rArr l^2 = 324`
`rArr l = 18 cm.`
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