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 August 6th, 2019, 10:50 PM #1 Senior Member   Joined: Aug 2014 From: India Posts: 476 Thanks: 1 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.
 August 6th, 2019, 11:27 PM #2 Senior Member   Joined: Apr 2014 From: UK Posts: 965 Thanks: 342 it means every 3 days, B and C are also working, with A, on the same job.
 August 7th, 2019, 05:13 AM #3 Global Moderator   Joined: Dec 2006 Posts: 21,026 Thanks: 2257 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.
August 7th, 2019, 05:15 AM   #4
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Quote:
 Originally Posted by skipjack A does 3/20 of the job in 3 days.
How you got 3 ?

 August 7th, 2019, 06:00 AM #5 Global Moderator   Joined: Dec 2006 Posts: 21,026 Thanks: 2257 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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