SOLUTION: if 15 masons build a brick wall in 9 days, how long will 35 masons need to do the same work?

SOLUTION: if 15 masons build a brick wall in 9 days, how long will 35 masons need to do the same work?

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Question 879272: if 15 masons build a brick wall in 9 days, how long will 35 masons need to do the same work?
Answer by josgarithmetic(39615) (Show Source): You can put this solution on YOUR website!
Use r for the rate of 1 worker to do 1 job. Fifteen masons work at the rate of 15r, and 35 masons work at the rate of 35r. The rate is unit of jobs per day.

Let d = time in DAYS for the 35 workers.

, which simply follows the uniform rate situation of RT=J and that J=1, for 1 job.
Solve for d.
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