Sona has some money. She can buy 30 books or 50 pens with it. She keeps 20% of the money for food and with the remaining buys 15 pens and some books. Find the number of books she buys.
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30 books = 50 pens
consider the amount as 30 * 50 = 1500
Sona kept 20% for food
So 80% is 1500 - 300 = 1200
1200 = 15P + X books
x books = 1200 - 15 * 30
x books = 1200 - 450 = 750
x books = 750/50 = 15
so can get 15 books
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