Ratio of-length to breadth of a rectangle is 5:4. If the area of that rectangle is 720 cm2 and breadth of this rectangle is equal to the side of a square then find the area of that square.

Options

A. `490cm^2`
B. `520 cm^2`
C. `640 cm^2`
D. `576 cm^2`

Answer

D

Explanation

Let the length and breadth of that rectangle be 5x and 4x cm respectively
ATQ
`5x xx 4x=720=720`
`x=6`
Breadth = 24 cm
Area of square `=576 cm^2`