Question:The area of a rectangle is thrice that of a square. If the length of the rectangle is 40 cm and its breadth is` 3/2` times that of the side of the square, then the side of the square is : 

A `15 cm` 
B `20 cm` 
C `30 cm` 
D `60 cm` 

+ Answer
B 

+ Explanation
Let the side of the square be x.

Then, breadth of rectangle` = 3/2 x`

`:. 40 xx 3/2 x = 3x^2 or x = 20`

Hence, the side of the square is 20 cm.

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Irin Moni

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