A ,B and c can do a piece of work in 15 ,12 and 20 days respectively . How long will they take to do the work together
Answers
Answer:
Step-by-step explanation:
If A can do this work in 12 days, he/she can do 112 of it in one day.
If B can do this work in 15 days, he/she can do 115 of it in one day.
If C can do this work in 20 days, he/she can do 120 of it in one day.
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If they can do these fractions of this work on one day, adding these numbers up, we can see how much of this work is done in one day by the three people working at the same time: 112+115+120=560+460+360=1260=15 . So the three people can do 15 of this work on one day. C left after two days, so before he left, 25 of this work were done. A does 112 of it every day, and B does 115 of it every day, so together, they do 112+115=560+460=960=320 of it every day. Since 25 of this work were done when C left, when only A and B started working on the project, there were 35=1220 of this work left. If 320 of it is done every day, it takes four days to complete the rest of this work. The remaining work will be completed by A and B in 4 days.
Step-by-step explanation:
Originally Answered: A, B, and C can do a piece of work in 15, 12, and 20 days respectively, they started the work together but C left after 2 days, in how many days will the remaining work be completed by A and B, the answer should be 1? The answer is 4 days. C can do 3u work per day.