The length of a rectangle is twice its breadth. If its length is decreased by 5 cm and breadth is increased by 5 cm, the area of the rectangle is increased by 75 sq.cm. Find the length of the rectangle? Pick one.
A) 10 cm  B) 20 cm  C) 30 cm  D) 40 cm  E) 50 cm
Solution   Let the breadth = x	Then length =2x   = [(2x-5)(x+5)-2x ] x [x=75]   x =20.   Length of the rectangle=20cm.   Answer 20 cm
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The length of a rectangle is twice its breadth. If its length is decreased by 5 cm and breadth is increased by 5 cm, the area of the rectangle is increased by 75 sq.cm. Find the length of the rectangle?