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Is the number of copies of a certain manuscript that n machines of

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Is the number of copies of a certain manuscript that n machines of  [#permalink]

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New post 24 Jun 2015, 04:26
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85% (01:13) correct 15% (01:18) wrong based on 265 sessions

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Is the number of copies of a certain manuscript that n machines of type A can make in one hour greater than the number of copies of the manuscript that k machines of type B can make in one hour?

(1) \(n > k\)

(2) The number of copies of the manuscript that n machines of type A can make in one hour is 20
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Re: Is the number of copies of a certain manuscript that n machines of  [#permalink]

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New post 24 Jun 2015, 05:04
erikvm wrote:
Is the number of copies of a certain manuscript that n machines of type A can make in one hour greater than the number of copies of the manuscript that k machines of type B can make in one hour?

(1) \(n > k\)

(2) The number of copies of the manuscript that n machines of type A can make in one hour is 20


Let, One Machine of "Type A" types in 1 hour = a copies
and, One Machine of "Type B" types in 1 hour = b copies

Then, 'n' Machine of "Type A" type in 1 hour = a*n copies
and, 'k' Machine of "Type A" type in 1 hour = b*k copies

Question : Is a*n > b*k?

Statement 1: \(n > k\)

But the relation between 'a' and 'b' is still unknown, therefore a*n may or may not be greater than b*k for various values of these variables

Hence, NOT SUFFICIENT

Statement 2: The number of copies of the manuscript that n machines of type A can make in one hour is 20

a*n = 20

But this value can't be compared with b*k as the values of b and k are still unknown
Hence, NOT SUFFICIENT

Combining the two statements

a*n = 20 and n>k

@a=2, n=10, k=5, b=5: a*n < b*k
and
@a=2, n=10, k=5, b=3: a*n > b*k
Hence, NOT SUFFICIENT

Answer: option
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Re: Is the number of copies of a certain manuscript that n machines of  [#permalink]

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New post 11 Dec 2017, 07:35
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erikvm wrote:
Is the number of copies of a certain manuscript that n machines of type A can make in one hour greater than the number of copies of the manuscript that k machines of type B can make in one hour?

(1) \(n > k\)

(2) The number of copies of the manuscript that n machines of type A can make in one hour is 20


We need to determine whether the number of copies of a certain manuscript that n machines of type A can make in one hour is greater than the number of copies of the manuscript that k machines of type B can make in one hour.

If we let the rate of a type A machine = a and the rate of a type B machine = b, then the work done by n machines of type A in an hour is na and the work done by k machines of type B is kb. Thus, we need to determine:

na > kb ?

Statement One Alone:

n > k

Although we know that n is greater than k, without knowing the relationship between a and b, statement one is not sufficient to answer the question.

Statement Two Alone:

The number of copies of the manuscript that n machines of type A can make in one hour is 20.

Although we know that na = 20, we still do not know anything about k or b, thus statement two alone is not sufficient to answer the question.

Statements One and Two Together:

Using the information from statements one and two, we still do not have enough information to answer the question. We know that na = 20 and that n > k, however, we do not have any information about b.

Answer: E
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Re: Is the number of copies of a certain manuscript that n machines of &nbs [#permalink] 11 Dec 2017, 07:35
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