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A shopkeeper, buys some books for 80. If hehad bought 4 more books for the same amount,each book would have cost 1 less. Find thenumber of books he bought. |
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Answer» Solution Let the number of books purchased for Rs.80 = xThen cost of each books = 80/xIf he buys 4 more books, the number of books = x+4Cost of each book = 80/x+4(80/x) - [80/(x+4)] = 1Solve x = -20 and x = 16Rejecting x = -20The number of books purchased = 16 |
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