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# Help!

Author Message
Intern
Joined: 11 Apr 2013
Posts: 34
GMAT 1: 720 Q47 V42
GMAT 2: 770 Q48 V48
GPA: 3.49
WE: Military Officer (Military & Defense)
Followers: 0

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

Help! [#permalink]  12 Jun 2013, 21:18
This problem single handedly screwed my quant section this week. I can't remember the exact numbers involved, but it was something like:

'n' parents split the $300 cost of a school trip equally. If the school had three less parents, each the parents would each pay an additional$3. Find 'n'

my method was...
300/n = x
300 = nx

and

300/n-3 = x +3
300 = nx + 3n - 3x - 9
sub nx = 300
300 = 300 + 3n - 3x - 9
9 = 3(n - x)
3 = n - x
.... then I don't know, not sure if I'm even doing this right. I think it was just jitters, but i spent 5 full minutes on this and finally just guessed.

My question is: what's the correct method here and has anyone seen a question similar to this so I can work it out with numbers that actually add up? This seems really easy but I'm just not getting something and it's driving me insane. Thanks!
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Intern
Joined: 11 Apr 2013
Posts: 34
GMAT 1: 720 Q47 V42
GMAT 2: 770 Q48 V48
GPA: 3.49
WE: Military Officer (Military & Defense)
Followers: 0

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

Re: Help! [#permalink]  18 Dec 2013, 06:58
bump - still not getting it
_________________

:: My test experience ::
http://gmatclub.com/forum/540-to-720-a-debrief-154257.html

\sqrt{scott}

Director
Status: Assisting candidates to get admit in to top global business schools
Affiliations: MBA
Joined: 12 May 2010
Posts: 631
Location: Bangalore
Schools: HEC, Paris
WE 1: 9 Years
Followers: 25

Kudos [?]: 76 [1] , given: 6

Re: Help! [#permalink]  21 Dec 2013, 01:44
1
KUDOS
Hi,

Approach is right.. some data is wrong as solving it is leading to irrational roots. To correct data, let n decreases by 5 and x increases by 5,
then we get 5 = n-x by your approach (instead of 3= n-x)

Next step is to put x= n-5 in the equation nx=300 , solve quadratic equation to get n = 20 and x =15

To know more about online GMAT classes visit http://bit.ly/XKxOPd

Feel free to write if you have any further queries.

Cheers!
Neha Singh
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Intern
Joined: 11 Apr 2013
Posts: 34
GMAT 1: 720 Q47 V42
GMAT 2: 770 Q48 V48
GPA: 3.49
WE: Military Officer (Military & Defense)
Followers: 0

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

Re: Help! [#permalink]  21 Dec 2013, 18:29
nehasingh1020 wrote:
Hi,

Approach is right.. some data is wrong as solving it is leading to irrational roots. To correct data, let n decreases by 5 and x increases by 5,
then we get 5 = n-x by your approach (instead of 3= n-x)

Next step is to put x= n-5 in the equation nx=300 , solve quadratic equation to get n = 20 and x =15

To know more about online GMAT classes visit http://bit.ly/XKxOPd

Feel free to write if you have any further queries.

Cheers!
Neha Singh

Thanks Neha!!! I think on the actual test the problem was that I wasn't resubbing after the first substitution in order to get a quadratic and solve that way. I'm used to two variable/two equation problems being a little more straightforward. Thanks for clarifying.
_________________

:: My test experience ::
http://gmatclub.com/forum/540-to-720-a-debrief-154257.html

\sqrt{scott}

Re: Help!   [#permalink] 21 Dec 2013, 18:29
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