Several difficult PS and DS questions!!! : GMAT Quantitative Section - Page 2
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# Several difficult PS and DS questions!!!

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Intern
Joined: 17 Jan 2010
Posts: 5
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Kudos [?]: 1 [0], given: 1

Re: Several difficult PS and DS questions!!! [#permalink]

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23 Jan 2010, 13:01
The official question is

On an aerial photograph, the surface of a pond appears as circular region of radius 7/16 inch. If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles, which of the following is the closest estimate of the actual surface area of the pond,in square miles?

A. 1.3
B. 2.4
C. 3.0
D. 3.8
E. 5.0

OA
[Reveal] Spoiler:
B

Now can someone please explain it in depth.
Intern
Joined: 28 Jan 2010
Posts: 30
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29 Jan 2010, 12:16
Summer3 wrote:
Damager wrote:
If a committee of 3 people is to be selected from among 5 married couples so that the
committee does not include two people who are married to each other, how many such
committees are possible?
A. 20
B. 40
C. 50
D. 80
E. 120

Total number of ways to select 3 out of 10=10C3=120
Combination with each couples 8C1 = 8
Total 5 couples 8*5=40

Combi with no couples = 120-40=80

Sorry, the part written in red is not clear. Please explain it. Thanks.

The red colored line represents all possible ways of selecting the third person in the committee aft a couple has been selected. So we need to select 1 person from the remaining 8.
Intern
Joined: 28 Jan 2010
Posts: 30
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Kudos [?]: 48 [0], given: 45

Re: Several difficult PS and DS questions!!! [#permalink]

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29 Jan 2010, 12:18
Quote:
Q6:
The ratio of the number of red cars in a certain parking lot to the number of black cars is
3 to 8. If there are 72 black cars in the lot, how many red cars are there in the lot?
A. 11
B. 15
C. 24
D. 27
E. 32
Wy not D??

IMO the ans is 27 and not 24.
Re: Several difficult PS and DS questions!!!   [#permalink] 29 Jan 2010, 12:18

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