Question c41bf

Dec 26, 2017

$60$ minutes
See a solution process below:

Explanation:

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

$2 \text{ teachers" xx 90 " minutes" = 180" minutes}$

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.