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Math Help - Finding 3/7th of a number

  1. #1
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    Finding 3/7th of a number

    Really basic question.. how on a calculator can I find say 5/7 of a number?

    Im trying to figure out the following equation.

    "If 3/7 of n is 42, what is 5/7 of n?"
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  2. #2
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    3/7 = 42

    so 1/7 must be 42 divide 3 = 14

    so 5/7 must 5 x 14 = 70
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  3. #3
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    If anything, I think the calculator would be a hindrance here. It's easier to set up on paper , and less chances to make mistakes. The answer is 70, and n=98.
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