Q. The sides of a rectangle are in the ratio 4 : 5. If the perimeter of the rectangle is 90 cm, then its sides are
(A) 28, 35
(B) 20, 24
(C) 20, 25
(D) None of these

Option C
solution is also there 
let the sides be x
now the sides will be 4x,5x
perimeter of rectangle = 2(l+b)
                                    =2(4x + 5x)
                                    =2(9x)
                                    =18x
but given, 
                    18x = 90
                       x = 90/18
                       x = 5
now sides,  
                      4x = 4(5) = 20
                      5x = 5(5) = 25