Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 22 Oct 2014, 21:11

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# If john makes a contribution to a charity fund at school, th

Author Message
TAGS:
Intern
Joined: 15 Jan 2010
Posts: 11
Followers: 0

Kudos [?]: 2 [0], given: 3

If john makes a contribution to a charity fund at school, th [#permalink]  22 Jan 2010, 10:16
00:00

Difficulty:

45% (medium)

Question Stats:

62% (02:11) correct 38% (01:11) wrong based on 158 sessions
If john makes a contribution to a charity fund at school, the average contribution size will increase by 50% reaching $75 per person. If there were 5 other contributions made before john's, what is the size of his donation? A.$100
B. $150 C.$200
D. $250 E.$450
[Reveal] Spoiler: OA
Intern
Joined: 21 Jan 2010
Posts: 49
Followers: 0

Kudos [?]: 20 [3] , given: 0

Re: 700-800 level problem Statistics [#permalink]  22 Jan 2010, 10:20
3
KUDOS
Cavg = average contribution before John

Cavg*1.5 = 75, therefore the average cont is $50 before John. If he needs to increase the average contribution by$25, he must put in $25 for each of the 5 people. so$125.
But, he also has to put in the average for himself (the sixth person), so add $75. So$200 is your answer.
_________________

________________________________________________________________________
Andrew
http://www.RenoRaters.com

CEO
Status: Nothing comes easy: neither do I want.
Joined: 12 Oct 2009
Posts: 2794
Location: Malaysia
Concentration: Technology, Entrepreneurship
Schools: ISB '15 (M)
GMAT 1: 670 Q49 V31
GMAT 2: 710 Q50 V35
Followers: 182

Kudos [?]: 987 [3] , given: 235

Re: 700-800 level problem Statistics [#permalink]  22 Jan 2010, 10:33
3
KUDOS
yes 200 is the ans.

final avg = 75 = 1.5 of old

i.e old avg = 50 = total of five/5

total of five = 250

new avg = 75 = total of six/6

total of 6 = 450

so John's contribution = 450-250 =200
_________________

Fight for your dreams :For all those who fear from Verbal- lets give it a fight

Money Saved is the Money Earned

Jo Bole So Nihaal , Sat Shri Akaal

Gmat test review :
670-to-710-a-long-journey-without-destination-still-happy-141642.html

Math Expert
Joined: 02 Sep 2009
Posts: 23381
Followers: 3607

Kudos [?]: 28804 [1] , given: 2849

Re: 700-800 level problem Statistics [#permalink]  22 Jan 2010, 10:35
1
KUDOS
Expert's post
1
This post was
BOOKMARKED
GMAT10 wrote:
If john makes a contribution to a charity fund at school, the average contribution size will increase by 50% reaching $75 per person.If there were 5 other contributions made before john's,what is the size of his donation? a)$100
b)$150 c)$200
d)$250 e)$450

Let a be the average contribution size before John makes his contribution.
Let c be the total contribution size before John makes his contribution.
Let x be John's contribution.

1.5a=75 --> a=50

a=50=\frac{c}{5} --> c=250

\frac{c+x}{6}=75 --> \frac{250+x}{6}=75 --> x=200

_________________
CEO
Joined: 09 Sep 2013
Posts: 2831
Followers: 206

Kudos [?]: 42 [0], given: 0

Re: If john makes a contribution to a charity fund at school, th [#permalink]  23 Sep 2013, 23:30
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.
_________________
Re: If john makes a contribution to a charity fund at school, th   [#permalink] 23 Sep 2013, 23:30
Similar topics Replies Last post
Similar
Topics:
John and Helen are making small bows for a craft project and 2 12 Nov 2012, 17:52
2 Contribution to a charity Fund 8 17 Nov 2011, 15:37
Funding for grad school 1 03 Jun 2011, 17:06
8 The school board proposed that funding for the school's 6 13 Feb 2009, 11:47
9 Unlike a funded pension system, in which contributions are 11 18 Nov 2006, 00:53
Display posts from previous: Sort by