SOLUTION: On average, it takes a teacher 39 minutes to grade a set of quizzes. It takes her teacher's aide twice as long to do the same grading. How long will it take if they work together
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Question 286877: On average, it takes a teacher 39 minutes to grade a set of quizzes. It takes her teacher's aide twice as long to do the same grading. How long will it take if they work together to grade a set of quizzes?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
You need to add their rates of working to get
their rate working together
Let = their time to finish working together
given:
1st teacher's time is min
teacher's aide's time is min
In words:
(1 set of quizzes/teacher's time) + (1 set of quizzes/aide's time) = (1 set of quizzes/time working together)
multiply both sides by
It will take them min working together
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