AMCAT Written Test Qs.(Quantitative Aptitude) :: Profit and Loss - Discussion

17balls cost - 720 = 5balls cost

17balls cost-5balls cost=720

12balls cost = 720

ball cost =720/12

ball cost = 60

Let the cost price of the ball is x
here we have 17 balls so the cost price be 17x
and the selling price is given for 17 balls is 720,
By using loss=costprice-selling price and given loss =cost price of 5 balls
loss=5x
then 5x=17x-720

12x=720

x=60
so the cost price of each ball is 60

(C.P. of 17 balls) - (S.P. of 17 balls) = (C.P. of 5 balls)

(C.P. of 17 balls) + (C.P. of 5 balls) = (S.P. of 17 balls)

                             (S.P. of 12 balls) = 720

one ball = 720/12 = 60/-.

Let the cost price of a ball is Rs.x
Given, on selling 17 balls at Rs. 720, there is a loss equal to the cost price of 5 balls
The equation is :
17x - 720 = 5x
Solving the equation 
we get x = 60
Therefore, cost price of a ball is Rs. 60