The length of a rectangle is twice its breadth . If its length is decreased by 5 cm and breadth is increased by 5 cm, he area of the rectangle is increassed by 75 sq.cm. Find he length of the rectangle .
Let breadth = `x` , then , length = `2x` , Then ,
`(2x - 5) (x + 5) - 2x xx x = 75`
`hArr 5x - 25 = 75`
`hArr 5x = 100` `hArr x = 20`
`:.` Length of the rectangle = 20 cm.
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