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Math Help - quadratic equations

  1. #1
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    Question quadratic equations

    a shopkeeper buys a number of books for Rs 80,if he had brought 4 more for the same amount ,each book would have cost Rs 1 less .how many books did he buy?
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by anjana
    a shopkeeper buys a number of books for Rs 80,if he had brought 4 more for the same amount ,each book would have cost Rs 1 less .how many books did he buy?
    Suppose he bought b books, then he paid 80/b Rupees per book.

    If he had bought b+4 books for 80 Rupees he would have paid 80/(b+4)
    Rupees for each book, but we are told this is 1 Rupee less than he did
    pay per book so:

    80/(b+4)=80/b - 1

    This is the equation you need to solve to find b the number of books he
    bought.

    RonL
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