Mathematics, 28.07.2019 01:00 kim643
The teachers assistant and grade homework papers by herself in one hour. if the teacher the grading can be completed in 20 minutes. how long will it take the teacher to grade the papers working alone?
Answers: 1
is the time the teacher takes to grade the homework papers
is the time the assistant takes to grade the homework papaers
is the tame they take to grade the homework papers working together
. We also know that If the teacher helps the grading can be completed in 20 minutes, so 
. Lets replace those values in our formula: 
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The teachers assistant and grade homework papers by herself in one hour. if the teacher the grading...
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