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 :
Let the side of the square be `x` cm, Then , its area = `x^2`. `cm^2`
Area of the rectangle = `(3x)^2` `cm^2`
`:.` `40 xx 3/2 xx x = 3x^2`
`hArr x = 20`
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