Notebooks cost $1.39 each. What are the possible numbers of notebooks that can be purchased with $10

Discussion in 'Calculator Requests' started by math_celebrity, Jan 3, 2017.

  1. math_celebrity

    math_celebrity Administrator Staff Member

    Notebooks cost $1.39 each. What are the possible numbers of notebooks that can be purchased with $10?

    Let n be the number of notebooks you can purchase. We have the following inequality:
    1.39n <= 10

    Divide each side by 1.39
    n <= 7.194

    We want whole notebooks, we cannot buy fractions of notebooks, so we have:
    n <= 7

    The question asks for the possible numbers of notebooks we can buy. This implies we buy at least 1, but our inequality says not more than 7. So our number set is:
    N = {1, 2, 3, 4, 5, 6, 7}
     

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