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anonymous

  • 5 years ago

martha rakes leaves in 6 hours her brother in 7 hours how long will it take them together to do the job

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  1. anonymous
    • 5 years ago
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    i came up with 42 im unsure

  2. dumbcow
    • 5 years ago
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    martha can do 1/6 of the job in 1 hour brother 1/7 of job in 1 hour 1/6 + 1/7 = 7/42 + 6/42 = 13/42 together they can do 13/42 of job in 1 hour 42/13 = 3 and 3/13 so it takes about 3 hours and 14 min

  3. anonymous
    • 5 years ago
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    someone help me

  4. anonymous
    • 5 years ago
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    i meant 42/13

  5. dumbcow
    • 5 years ago
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    you were correct :)

  6. anonymous
    • 5 years ago
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    thank you smartcow

  7. anonymous
    • 5 years ago
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    help u with what prettychick?

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