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Math Help - proportion problem

  1. #1
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    proportion problem

    If it takes 6 men 4 days to dig a hole 3 feet deep, how long will it take 10 men to dig a hole 7 feet deep?

    Now, i am up to the part that it would take one man 8 days to dig one foot

    stuck from there on how to make an equation

    i know the answer would be 5.6 (or 6 to the nearest day)

    as (7 x 8) /10 = 5.6

    but i am looking for a neat formula to use for future problems
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  2. #2
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    Quote Originally Posted by 200001 View Post
    If it takes 6 men 4 days to dig a hole 3 feet deep, how long will it take 10 men to dig a hole 7 feet deep?

    Now, i am up to the part that it would take one man 8 days to dig one foot

    stuck from there on how to make an equation

    i know the answer would be 5.6 (or 6 to the nearest day)

    as (7 x 8) /10 = 5.6

    but i am looking for a neat formula to use for future problems
    If it takes 6 men 4 days to dig 3 feet, then

    It will take 1 man 24 days to dig 3 feet, then

    It will take 1 man 8 days to dig 1 foot.


    Therefore, it will take 1 man 56 days to dig 7 feet, then

    It will take 10 men 5.6 days to dig 7 feet.
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