SOLUTION: Robilll can do 2 jobs in 3 days, and Burray can do 5 jobs in 6 days. Robill works for 3 days and then Burray begins to help. How many days will it take to complete a total of 74

Question 67681This question is from textbook Advanced mathematics
: Robilll can do 2 jobs in 3 days, and Burray can do 5 jobs in 6 days. Robill works for 3 days and then Burray begins to help. How many days will it take to complete a total of 74 jobs? This question is from textbook Advanced mathematics

Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Robilll can do 2 jobs in 3 days, and Burray can do 5 jobs in 6 days. Robill works for 3 days and then Burray begins to help. How many days will it take to complete a total of 74 jobs?
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Robills rate is (2/3) job/day
Burrays rate is (5/6) job/day
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In 3 days Robill will complete 3(2/3)job/day=2jobs
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Working together R and B must complete 74-2 = 72 jobs.
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EQUATION:
If the number of days needed is "x"
(x days)( 2/3 job/day + 5/6 job/day ) = 72 jobs
x(9/6)=72
x=72(6/9)=48 days to complete 72 jobs.
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Cheers,
Stan H.
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