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A certain used-book dealer sells paperback books at 3 times dealer’s cost and hardback books at 4 times dealer’s cost. Last week the dealer sold a total of 120 books, each of...
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Solution

Let, the total number of paperback books and hardback books is P and H respectively.P + H = 120 ——-(1)Cost price of 120 books = 120 × 10...

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