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Word Problems/Mathematics problem


Janet Yang wrote at 2015-07-28 12:12:45
It takes them 20/7 days to do the job. They complete 7/20 of the job per day.

Suppose B does the job in b days. He does 1/b of the job per day.

A does the job in żb days. She does 1/(żb) = 4/(3b) of the job per day.

Together, they complete 4/(3b) + 1/b of the job per day.

4/(3b) + 1/b = 7/20

7/(3b) = 7/20

b = 20/3 = 6⅔

B does the job in 6⅔ days.

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