The area of a square is 6400 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is thrice the side of the square and breadth is 30 cm less than the side of the square? Choose the most appropriate option:
A) 5:24 B) 5:19 C) 5:13 D) 5:22 E) 5:18
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 = 6400   a = (6400)^1/2 = 80   l = 3a and b = a - 30   b : l = a - 30 : 2a = 50 : 240 = 5:24   5:24nswer: 5:24
<result>A</result>
The area of a square is 6400 sq cm. Find the ratio of the breadth and the length of a rectangle whose length is thrice the side of the square and breadth is 30 cm less than the side of the square?