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# If 20 percent of the students at a certain school went to a camping tr

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Manager
Joined: 24 Nov 2010
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Location: United States (CA)
Concentration: Technology, Entrepreneurship
Schools: Ross '15, Duke '15
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If 20 percent of the students at a certain school went to a camping tr [#permalink]

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20 Mar 2011, 21:13
1
This post was
BOOKMARKED
00:00

Difficulty:

55% (hard)

Question Stats:

58% (02:54) correct 42% (01:47) wrong based on 74 sessions

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If 20 percent of the students at a certain school went to a camping trip and took more than $100, and 75 percent of the students who went to the camping trip did not take more than$100, what percentage of the students at the school went to the camping trip?

(A) 95
(B) 90
(C) 85
(D) 80
(E) 75
[Reveal] Spoiler: OA
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Re: If 20 percent of the students at a certain school went to a camping tr [#permalink]

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20 Mar 2011, 23:54
1
KUDOS
Let x be the number of students in the school. 0.2x students went to the trip and took more than 100$. They compose (100-75)=25% of all students who went to the trip. Therefore the toal of 0.2x/0.25=0.8x students went to the camping which is 80%. The answer is D _________________ If my post is useful for you not be ashamed to KUDO me! Let kudo each other! SVP Joined: 16 Nov 2010 Posts: 1673 Location: United States (IN) Concentration: Strategy, Technology Followers: 34 Kudos [?]: 470 [0], given: 36 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 21 Mar 2011, 00:09 1 This post was BOOKMARKED X -> Total # of students Y -> went to camp 0.2x -> Camp with >$100

0.75 * y -> Camp with < 100

So 0.25 of y took > $100 0.25y = 0.2x => y/x = 20/25 * 100 = 80% Answer - D _________________ Formula of Life -> Achievement/Potential = k * Happiness (where k is a constant) GMAT Club Premium Membership - big benefits and savings Senior Manager Joined: 11 Apr 2011 Posts: 268 Followers: 30 Kudos [?]: 399 [0], given: 13 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 07 Jun 2011, 08:26 what is the source of this question? _________________ Powerscore CR Bible Full Chapter Notes | Easily Extend Vocabulary List with Google Dictionary Please kudo me if you found my post useful. Thanks!!! Senior Manager Joined: 12 Dec 2010 Posts: 282 Concentration: Strategy, General Management GMAT 1: 680 Q49 V34 GMAT 2: 730 Q49 V41 GPA: 4 WE: Consulting (Other) Followers: 9 Kudos [?]: 45 [0], given: 23 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 07 Jun 2011, 08:37 dreambeliever wrote: If 20 percent of the students at a certain school went to a camping trip and took more than$100, and 75 percent of the students who went to the camping trip did not take more than $100, what percentage of the students at the school went to the camping trip? (A) 95 (B) 90 (C) 85 (D) 80 (E) 75 Better way to approach these kind of problems are pick a simple number (total) say we have a total 100 students. Now read the bolded part carefully- it prompts you immediately that (X-0.75X)= 0.25X (where x is the % students going for the camping) is the % total students (which is same as 20% of total students). So 0.25X = 20% of 100 -> X= 80 so D _________________ My GMAT Journey 540->680->730! ~ When the going gets tough, the Tough gets going! Manager Joined: 08 Sep 2010 Posts: 167 Followers: 0 Kudos [?]: 20 [0], given: 18 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 11 Jun 2011, 08:09 Agree with D, good explanation bagrettin _________________ My will shall shape the future. Whether I fail or succeed shall be no man's doing but my own. If you like my explanations award kudos. Intern Joined: 24 May 2011 Posts: 22 Followers: 0 Kudos [?]: 6 [0], given: 5 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 14 Jun 2011, 09:16 Can someone help me understand the question? I must be sounding silly however my doubt is, If 20% of students at a certain school went to a camping trip, then what is the point in asking the percentage of students at school who went to the camping trip? Math Forum Moderator Joined: 20 Dec 2010 Posts: 2021 Followers: 157 Kudos [?]: 1560 [1] , given: 376 Re: If 20 percent of the students at a certain school went to a camping tr [#permalink] ### Show Tags 14 Jun 2011, 11:15 1 This post received KUDOS shm0401 wrote: Can someone help me understand the question? I must be sounding silly however my doubt is, If 20% of students at a certain school went to a camping trip, then what is the point in asking the percentage of students at school who went to the camping trip? Genuine doubt: Please read the question now; [highlight]If 20 percent of the students at a certain school went to a camping trip AND took more than$100[/highlight], and 75 percent of the students who went to the camping trip did not take more than $100, what percentage of the students at the school went to the camping trip? The highlighted part is one giant sentence and should be read together. e.g. 100- Students 20- Students went to the trip AND also took more than$100

Say, x students went to the trip.
So, x-20 will be the percent of student who took less than or equal to \$100 with them.

And it is given that this x-20=75% who went to the picnic
OR
x-20=0.75x
x=80
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Re: If 20 percent of the students at a certain school went to a camping tr [#permalink]

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14 Jun 2011, 19:22
Thank you Fluke.
The wordings in the problem are a problem themselves..
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Re: If 20 percent of the students at a certain school went to a camping tr [#permalink]

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22 Feb 2015, 11:32
Hello from the GMAT Club BumpBot!

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Re: If 20 percent of the students at a certain school went to a camping tr [#permalink]

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30 Mar 2016, 11:18
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
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Re: If 20 percent of the students at a certain school went to a camping tr   [#permalink] 30 Mar 2016, 11:18
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