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Working at the same constant rate, 4 machines,

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GRE Instructor
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Joined: 10 Apr 2015
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Working at the same constant rate, 4 machines, [#permalink] New post 29 Dec 2016, 12:13
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Question Stats:

100% (01:22) correct 0% (00:00) wrong based on 6 sessions
Working at the same constant rate, 4 machines, working together, take 8 days to make a total of 16 birdhouses.
How many such machines are required to make 64 birdhouses in 16 days?
A) 2
B) 4
C) 8
D) 16
E) 32
[Reveal] Spoiler: OA

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GRE Instructor
User avatar
Joined: 10 Apr 2015
Posts: 1175
Followers: 44

Kudos [?]: 1048 [0], given: 6

CAT Tests
Re: Working at the same constant rate, 4 machines, [#permalink] New post 29 Dec 2016, 12:17
Expert's post
GreenlightTestPrep wrote:
Working at the same constant rate, 4 machines, working together, take 8 days to make a total of 16 birdhouses.
How many such machines are required to make 64 birdhouses in 16 days?
A) 2
B) 4
C) 8
D) 16
E) 32


4 machines take 8 days to make 16 birdhouses.
So, in ONE DAY, the 4 machines, can make a total of 2 birdhouses
So, in 16 days, those same 4 machines can make 32 birdhouses
So, if we add an additional 4 machines (that can also make 32 birdhouses in 16 days), the 8 combined machines will make 64 birdhouses in 16 days.

Answer: C
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Re: Working at the same constant rate, 4 machines,   [#permalink] 29 Dec 2016, 12:17
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Working at the same constant rate, 4 machines,

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