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John can complete a given task in 20 days. Jane will take

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Re: John can complete a given task in 20 days. Jane will take  [#permalink]

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New post 03 Mar 2018, 20:32
raissatianang wrote:
hello folks
i totaly agree that the total number spend on this work is 10 days. but i have a question regarding the way the question is ask. it is asking 'In how many days did the work get over from the time John and Jane started to work on it together?'. i feel like from the time they start work together it is 6 not 10 cuz john start alone. please can you explain me why it is 10. please somebody to respond to me


The question tells us: "John and Jane set out to complete the task by beginning to work together. However, Jane was indisposed 4 days before the work got over."

So they started working together and John completed it at the end. It took 10 days to complete.

It asks: "In how many days did the work get over from the time John and Jane started to work on it together"

From the time they started, how many days did it take to finish the work? From the time they started, it tool 10 days. Who worked for how many days doesn't matter. The work took 10 days to complete.
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Re: John can complete a given task in 20 days. Jane will take  [#permalink]

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New post 03 Mar 2018, 23:18
arjtryarjtry wrote:
John can complete a given task in 20 days. Jane will take only 12 days to complete the same task. John and Jane set out to complete the task by beginning to work together. However, Jane was indisposed 4 days before the work got over. In how many days did the work get over from the time John and Jane started to work on it together?

A. 6
B. 10
C. 8
D. 7.5
E. 3.5


Let's say there are 60 units of work to be done. So, John completes 3 units/day, while Jane completes 5 units/day.
If the work finished in d days from the time it started, then the work done by each 5(d-4) + 3d = 60 = > d = 10
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Re: John can complete a given task in 20 days. Jane will take &nbs [#permalink] 03 Mar 2018, 23:18

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