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Six machines, each working at the same constant rate

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Joined: 02 Jun 2015
Posts: 20
Location: United States
Re: Six machines, each working at the same constant rate  [#permalink]

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New post 01 Dec 2018, 12:33
Another option to solve this question is using Backsolving.

W= R x T
W= 6 machines x 12 days = 72 days for 1 machine to complete the job.

Now, we need to find "extra" machines that match "72 days per machine".

If we select:

A) 2 we will have 8 machines x 8 days = 64 days for 1 machine to complete the job. Not a match! Out!!

B) 3 we will have 9 machines x 8 days = 72 days for 1 machine to complete the same job in the same rate!! That's a match!

Answer: B


Thanks!
Alecita :)
GMAT Club Bot
Re: Six machines, each working at the same constant rate   [#permalink] 01 Dec 2018, 12:33

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