Homework Help: math

Posted by help pleaseee on Sunday, September 9, 2012 at 6:26pm.

mr. Rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4 1/2 hours. If Mr. Rodriguez graded the papers for 1 hour and then left the job for his assistant to complete, how long will it take his assistant to finish grading papers?

math - Damon, Sunday, September 9, 2012 at 6:35pm
R did 1/3 of the job

So A has to do 2/3 of the job

(2/3) (4 1/2) = (2/3)(9/2) = 3 hours
math - Anonymous, Monday, September 10, 2012 at 5:20pm
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