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 70 sq. cm. Find the length of the rectangle.	Choose the correct choice from the following answers:
A) 12cm
B) 14cm
C) 16cm
D) 18cm
E) 20cm
Explanation:   Let breadth = x. Then, length = 2x. Then,   (2x - 5) (x + 5) - 2x * x = 70 =&gt; 5x - 25 = 70 =&gt; x = 18.   Length of the rectangle = 18 cm.   Answer: Option 18cm
<result>D</result>
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 70 sq. cm. Find the length of the rectangle.