SOLUTION: 8 men OR 15 boys can do a job in 20 days. How many days will a group of 4 men and 5 boys take for the same job?

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Question 807913: 8 men OR 15 boys can do a job in 20 days. How many days will a group of 4 men and 5 boys take for the same job?
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
8*20=160 man days each man day 1/160 of the job
15*20=300 boy days each boy day is 1/300 of the job
(4/160+5/300)d=1
d=24 days