Question 879272
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(15r*9=35r*d)}}}, which simply follows the uniform rate situation of RT=J and that J=1, for 1 job.
Solve for d.