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A shop keeper buys a number of books for...

A shop keeper buys a number of books for Rs.80. If he had bought 4 more books for the same amount, each book would have cost his Rs.1 less .How many books did he buy?

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Let the shopkeeper buy` x `number of books.
According to the given condition cost of x books =Rs`80`
Therefore cost of each book `=80/x``
Again when he had brought` 4` more books
...
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