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Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Working at the same constant rate, 4 machines,
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29 Dec 2016, 12:13
29 Dec 2016, 12:13
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Question Stats:
83% (01:09) correct
16% (01:07) wrong based on 66 sessions
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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
How many such machines are required to make 64 birdhouses in 16 days?
A) 2
B) 4
C) 8
D) 16
E) 32
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: Working at the same constant rate, 4 machines,
[#permalink]
29 Dec 2016, 12:17
29 Dec 2016, 12:17
1
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
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
Re: Working at the same constant rate, 4 machines,
[#permalink]
04 May 2020, 21:39
04 May 2020, 21:39
Something here just doesn't make sense, which figures because it's a Greenlight problem, but anyway...
If it takes 4 machines 8 days to make 16 birdhouses, this means that it takes 1 machine 2 days to make 4 birdhouses, correct? Just divide everything by 4.
So we have 1 machine = 2 days = 4 houses. How many are required to make 64 houses in 16 days? The numbers just don't add up. In 16 days, 8 machines can make 32 houses only, NOT 64. Throw the question out.
If it takes 4 machines 8 days to make 16 birdhouses, this means that it takes 1 machine 2 days to make 4 birdhouses, correct? Just divide everything by 4.
So we have 1 machine = 2 days = 4 houses. How many are required to make 64 houses in 16 days? The numbers just don't add up. In 16 days, 8 machines can make 32 houses only, NOT 64. Throw the question out.
