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At a certain committee meeting only associate professors

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by BTGModeratorVI » Tue Mar 10, 2020 7:22 am

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At a certain committee meeting only associate professors and assistant professors are present. Each associate professor has brought 2 pencils and 1 chart to the meeting, while each assistant professor has brought 1 pencil and 2 charts. If a total of 10 pencils and 11 charts have been brought to the meeting, how many people are present?

A. 6
B. 7
C. 8
D. 9
E. 10

Answer: B
Source: GMATPrep test
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Re: At a certain committee meeting only associate professors

by Brent@GMATPrepNow » Wed Mar 11, 2020 6:12 am
BTGModeratorVI wrote: ↑
Tue Mar 10, 2020 7:22 am
 At a certain committee meeting only associate professors and assistant professors are present. Each associate professor has brought 2 pencils and 1 chart to the meeting, while each assistant professor has brought 1 pencil and 2 charts. If a total of 10 pencils and 11 charts have been brought to the meeting, how many people are present?

A. 6
B. 7
C. 8
D. 9
E. 10

Answer: B
Source: GMATPrep test
Notice that the question asks us to find that TOTAL number of people present.
In other words, it the question does NOT ask us to find the number of associate professors or the number of assistant professors present.

Since each person brings THREE items, and since a total of 21 items were brought (10 pencils and 11 charts), the number of people = 21/3 = 7

Answer: B

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Brent
Brent Hanneson - Creator of GMATPrepNow.com
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Re: At a certain committee meeting only associate professors

by Scott@TargetTestPrep » Thu Mar 12, 2020 6:30 am
BTGModeratorVI wrote: ↑
Tue Mar 10, 2020 7:22 am
 At a certain committee meeting only associate professors and assistant professors are present. Each associate professor has brought 2 pencils and 1 chart to the meeting, while each assistant professor has brought 1 pencil and 2 charts. If a total of 10 pencils and 11 charts have been brought to the meeting, how many people are present?

A. 6
B. 7
C. 8
D. 9
E. 10

Answer: B
Source: GMATPrep test
We can let the number of associate professors = a and the number of assistant professors = n, and create two equations:

Pencil equation:

2a + n = 10

Chart equation:

a + 2n = 11

Let’s add the two equations together:

3a + 3n = 21

a + n = 7

Thus, there are 7 people at the meeting.

Answer: B

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