A rectangle has 20 meter length and 15 meter breadth. Find ratio between area of rectangle and square whose side is same with rectangle's length. Choose the correct choice from the following answers.
A) 3 : 2
B) 3 : 4
C) 4 : 5
D) 2 : 3
E) 2 : 5

Rationale: area of rectangle = 20 * 15 = 300 area of square = 20 ^ 2 = 400 ratio of rectangle ' area and square ' s area = 300 : 400 = 3 : 4 answer : b
Answer: B