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August 6th, 2019, 10:50 PM  #1 
Senior Member Joined: Aug 2014 From: India Posts: 458 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: 953 Thanks: 340 
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: 20,921 Thanks: 2203 
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 
Senior Member Joined: Aug 2014 From: India Posts: 458 Thanks: 1  
August 7th, 2019, 06:00 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,921 Thanks: 2203 
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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