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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Thu Jun 11, 2009 3:42 am

Of the 240 students, 60 are studying both P and T. Is the number of the students who are studying neither of them greater than 140?
1) The number of the students studying P is greater than the students studying T
2) 101 students are studying P.

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Source: Beat The GMAT — Data Sufficiency | Thu Jun 11, 2009 3:42 am

SanjeevK: Senior | Next Rank: 100 Posts; Posts: 89; Joined: Sat May 30, 2009 2:49 am; Thanked: 9 times

by SanjeevK » Thu Jun 11, 2009 4:34 am

IMO B
Let the number of students studying P is p and T is t
Let the number of students studying neither is n
so we have 240 - n = p + t - 60
300 - n = p + t
n = 300 - (p + t)
a: p>t. put p = 200, t = 99. n = 1
put p = 60, t = 60. n = 180
insufficient

b: p = 101.
minimum value of t is 60 (since 60 are studying both P and T)
n <= [300-(101+60)]
n <= 139
sufficient

What is the OA

Hope this helps

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Stuart@KaplanGMAT: GMAT Instructor; Posts: 3225; Joined: Tue Jan 08, 2008 2:40 pmFollowed by: 614 members; Location: Toronto; Thanked: 1710 times; GMAT Score:800

Re: students

by Stuart@KaplanGMAT » Thu Jun 11, 2009 10:36 am

ketkoag wrote:Of the 240 students, 60 are studying both P and T. Is the number of the students who are studying neither of them greater than 140?
1) The number of the students studying P is greater than the students studying T
2) 101 students are studying P.

let's try this with less math!

1) P > T

Let's look at two extreme possibilities:

P=61, T=60

and

P = 240, T=60

In the first case, we have 240-61 = 179 people studying neither.

In the second case, we have 240-240 = 0 people studying neither.

Is the number of people studying neither greater than 140? Sometimes yes, sometimes no: insufficient.

2) P = 101

If P = 101, then the maximum number of people who studied neither is 240-101 = 139. Is the number of students who studied neither greater than 140? Definitely not: sufficient.

(2) is sufficient, (1) is not: choose (B)

Stuart Kovinsky | Kaplan GMAT Faculty | Toronto

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