Question

# On selling 17 balls at Rs 720, there is a loss that is equal to the cost price of 5 balls. Then what is the cost price of a single ball?

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Hint: Assume a variable x which will represent the cost price of a single ball. Since 17 balls were sold, the cost price of these 17 balls will be 17x. The loss will be given by subtracting the selling price of 17 balls from the cost price of 17 balls. This loss is equal to the cost price of 5 balls i.e. 5x. Using this, we can form an equation in x which can be solved to find the value of x.

$\Rightarrow$ 12x = 720
$\Rightarrow$ x = 60