Rita had enough money to buy 15 books for Rs 30 each. If the price of each book increases resulting in a total cost increase of Rs 45. How many books can she buy now? 
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 Rita had enough money for 15 books when price of each is Rs 30..the money she has=Rs 450
Now the price has increased but the money left with her is same...therefoer no.of books she can buy=450/45=10
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