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GMATprep Data sufficiency question

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GMATprep Data sufficiency question

by Marioo2 » Mon Oct 25, 2010 9:56 pm
How many people received a certain survey?

1) six tenths of those who received the survey responded

2) of those who received the survey, 42 responded

OA is C.

Why?

Choose A and got it wrong obviously... i mean the question talks about how many people received not the people who responded it... or am i getting it wrong>?
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by Rahul@gurome » Mon Oct 25, 2010 10:08 pm
Marioo2 wrote:How many people received a certain survey?

1) six tenths of those who received the survey responded

2) of those who received the survey, 42 responded

OA is C.

Why?

Choose A and got it wrong obviously... i mean the question talks about how many people received not the people who responded it... or am i getting it wrong>?
Yes, the question asks how many people received the survey not how many people responded it. We can proceed as follows,

Say, number of people received the survey = x

Statement 1: Six tenths of those who received the survey responded.
Therefore, number of people responded = (6/10)x
We cannot find x from this.

Not sufficient.

Statement 2: of those who received the survey, 42 responded.
No relation given with x.

Not sufficient.


1 & 2 together: (6/10)x = 42 => x = (42*10)/6
Thus we can find the number of people received the survey.

The correct answer is C.
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by Marioo2 » Mon Oct 25, 2010 10:11 pm
Rahul@gurome wrote:
Marioo2 wrote:How many people received a certain survey?

1) six tenths of those who received the survey responded

2) of those who received the survey, 42 responded

OA is C.

Why?

Choose A and got it wrong obviously... i mean the question talks about how many people received not the people who responded it... or am i getting it wrong>?
Yes, the question asks how many people received the survey not how many people responded it. We can proceed as follows,

Say, number of people received the survey = x

Statement 1: Six tenths of those who received the survey responded.
Therefore, number of people responded = (6/10)x
We cannot find x from this.

Not sufficient.

Statement 2: of those who received the survey, 42 responded.
No relation given with x.

Not sufficient.


1 & 2 together: (6/10)x = 42 => x = (42*10)/6
Thus we can find the number of people received the survey.

The correct answer is C.

Wow, thanks. Im doing my gmat on friday, im so scared... i need at least 500 points... been getting 400 points in the preps... must keep studying
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