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Q.

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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a

Rs.60

b

Rs.52

c

Rs.70

d

Rs.700 

answer is A.

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Detailed Solution

Concept: Let the cost price of a ball be x.
Cost of selling 17 balls is 720 with a loss equal to the cost of 5 balls.
https://lh5.googleusercontent.com/uyMCyl4MNdkJk8JP2dLhF0xTipdEbH9ViCsUB86kfUfi7kkNKcX72xl42DocPk4qttsmyOoqXMXru-hBS5WqueQWsLc7ky8Hv-DLLplz_kMnJWHWabJmoN4JaBFSyXPRJoGFRa0zZxHxBupAxkO_We get this relation because by selling these 17 balls at Rs. 720  there is a loss of cost of 5 balls.
https://lh5.googleusercontent.com/aHYDP3F4nwQKolBeEdeBCBPJMNm6xcJHndTxoxH_IKX7hT9UxPyFakg6BNuowuOt8cgzGiE56gnMM3mLQUSBdsdbIJdx0xGnxXLiclvN2g6vWStrPr6mNRm5qlPYIEqFgNFwlXEUULQtK8vJ0ouyHence, the correct answer is option 1) Rs.60
 
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