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August 6th, 2019, 10:50 PM   #1
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What is the meaning of : A is helped by B & C every 3 rd day?

A can do a job in 20 days, B in 30 days and C in 60 days. If A is helped
by B & C every 3rd day
, how long will it take for them to complete the
job?

What is the meaning of: A is helped by B & C every 3rd day?

Last edited by skipjack; August 7th, 2019 at 05:02 AM.
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August 6th, 2019, 11:27 PM   #2
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it means every 3 days, B and C are also working, with A, on the same job.
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August 7th, 2019, 05:13 AM   #3
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A does 3/20 of the job in 3 days. A is helped by B & C on the third day, B doing 1/30 of the job and C doing 1/60 of the job.

As 3/20 + 1/30 + 1/60 = 1/5, the job is completed in 3 × 5 = 15 days.
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August 7th, 2019, 05:15 AM   #4
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Quote:
Originally Posted by skipjack View Post
A does 3/20 of the job in 3 days.
How you got 3 ?
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August 7th, 2019, 06:00 AM   #5
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A does 1/20 of the job in each of the 3 days, i.e. 3/20 of the job in total.
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