SOLUTION: A cement factory estimates that 10 men must work for 8 hours each day to complete a job in 30 days. If only 8 men are to complete the job in 40 days, how long must they work each d

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Question 1161494: A cement factory estimates that 10 men must work for 8 hours each day to complete a job in 30 days. If only 8 men are to complete the job in 40 days, how long must they work each day?
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
If r for the rate per hour of any 1 man,
x number of hours each day for the question,

Number of total work hours would be (workhours/day)*(numberofdays);

10r%2A8%2A30=1=8%2Ar%2Ax%2A40

To solve for x,
%288%2A40rx%29%2F%2810%2A8%2A30r%29=1
.
.
x=7%261%2F2
They work seven and a half hours each day.