A can do a piece of work in 20 days and B in 30 days. They work together for 7 days and then both leave the work. Then C alone finishes the remaining work in 10 days. In how many days will C finish the full work?
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The rate of A 120120 job per day;
The rate of B 130130 job per day.
Say they need tt days to complete the project.
According to the stem we have that B works for all tt days and A works only for t−10t−10 days, thus 120∗(t−10)+130∗t=1120∗(t−10)+130∗t=1 --> t=18t=18days.
The rate of B 130130 job per day.
Say they need tt days to complete the project.
According to the stem we have that B works for all tt days and A works only for t−10t−10 days, thus 120∗(t−10)+130∗t=1120∗(t−10)+130∗t=1 --> t=18t=18days.
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