shopkeeper buy some books for rupees 80 . if he had bought 4 more books for the same amount each book would have cost rupees one less. find number of the books he bought
shopkeeper buy some books for rupees 80 . if he had bought 4 more books for the same amount each book would have cost rupees one less. find number of the books he bought
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x*y = 80
4 more books (x+4) for same amount, but each book one rupee less (y-1)
(x+4)*(y-1) = 80
on solving above two equations x = 16, y = 4