Question #c41bf

1 Answer
Dec 26, 2017

Answer:

#60# minutes
See a solution process below:

Explanation:

Assuming each teacher can grade an essay in the same amount of time:

#2" teachers" xx 90 " minutes" = 180" minutes"#

It took the two teachers #180# total minutes to grade #30# essays.

If we divide the #180# minutes by #3# we can find how long it would take for 3 teachers:

#(180" minutes")/3 = 60" minutes"#

It would take 3 teachers #60# minutes to grade the #30# essays.