SOLUTION: if 10 persos done a job in 18 days then 12 persons done the same job in how many days?

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Question 804142: if 10 persos done a job in 18 days then 12 persons done the same job in how many days?
Answer by josgarithmetic(39626) About Me  (Show Source):
You can put this solution on YOUR website!
ONE of those person does a same job in 18*10=180 days. This is rate of 1/180 jobs per day for just ONE person. Rates are directly additive for each person when they work together, so 12 persons together have the rate of 12*(1/180) jobs per day, or 180/12 DAYS per JOB.

180%2F12=3%2A3%2A2%2F%283%2A2%2A2%29=3%2F2 days for the job.

1%261%2F2 days.