shopkeeper buys a number of books rupees 1200 he had bought 10 more books for the same amount he each book would have cost rupees 20 less how many book did he buy
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each book cost = rs.20
no. of books bought at 1st time
= 1200/20=60
60=+10 = 70
(10 books he bought later)
no. of books bought at 1st time
= 1200/20=60
60=+10 = 70
(10 books he bought later)
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