On selling 17 balls at Rs.720, there is a loss equal to the cost of 5 balls. What is the cost price of a ball?
Let say , the cost of one ball is c.
So, the cost of 17 balls=17c.
So, Loss=17c-720.
Cost of 5 balls =5c.
So,
$$17c-720=5c.$$
or,$$12c=720.$$
or,$$c=60.$$
D is correct choice.
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