SOLUTION: 15 workers can build a wall in12 days.How many workers are need if the wall is to be built in 9 days?

Question 761591: 15 workers can build a wall in12 days.How many workers are need if the wall is to be built in 9 days?
Answer by josgarithmetic(39618) (Show Source): You can put this solution on YOUR website!
One way to find how many is, what is the rate of work from 1 worker?
1 job is, "build the wall". From the given about 15 workers, 1 worker builds the wall in 12*15 days, so jobs per day.

The rates of workers building together are simply added. How many workers, n, build the wall in 9 days? . That is Rate*Time=Jobs.

workers.
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