Question 994843
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See the lesson &nbsp;<A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Word-problems-WORKING-TOGETHER-by-Fractions.lesson>Using fractions to solve word problems on joint work</A>&nbsp; in this site, &nbsp;especially &nbsp;<U>Problem 6</U>&nbsp; of this lesson which is very similar to yours.


In this lesson you will find the solutions of many other problems on joint work. 


Good luck!