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

Algebra ->  Customizable Word Problem Solvers  -> Mixtures -> SOLUTION: if 15 masons build a brick wall in 9 days, how long will 35 masons need to do the same work?      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

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) About Me  (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.

highlight_green%2815r%2A9=35r%2Ad%29, which simply follows the uniform rate situation of RT=J and that J=1, for 1 job.
Solve for d.