The area of a square is 4900 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is same the side of the square and breadth is 20 cm less than the side of the square?
Select
A) 5:8 B) 5:10 C) 5:13 D) 5:7 E) 5:16
Let the length and the breadth of the rectangle be l cm and b cm respectively. Let the side of the square be a cm.   a2 = 4900   a = (4900)^1/2 = 70   l = a and b = a - 20   b : l = a - 20 : a = 50 : 70 = 5:7   Answer: 5:7
<result>D</result>
The area of a square is 4900 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is same the side of the square and breadth is 20 cm less than the side of the square?