A shopkeeper buys a number of books for Rs80. If he had bought four more books for the same amount, each book would have costed him Rs1 less. How many books should he buy
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16 books he should buy by quadratic equation let no of books be x.
80/x-80/x+4=1.
X^2+4x-320=0
80/x-80/x+4=1.
X^2+4x-320=0
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