anonymous
  • anonymous
martha rakes leaves in 6 hours her brother in 7 hours how long will it take them together to do the job
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
i came up with 42 im unsure
dumbcow
  • dumbcow
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
anonymous
  • anonymous
someone help me

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anonymous
  • anonymous
i meant 42/13
dumbcow
  • dumbcow
you were correct :)
anonymous
  • anonymous
thank you smartcow
anonymous
  • anonymous
help u with what prettychick?

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