Question 1054476
"Harvest the crops in the field" is one whole job.


Constant Work Rate Rule is RT=J and here, unit for T is HOURS, and unit for J is JOB; and you are mostly dealing with 1 JOB.


r is the work rate for ONE farmer, and n is the unknown number of farmers in the question.


{{{system(12*r*20=1,n*r*15=1)}}}