BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Picnic

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Legendary Member
Posts: 504
Joined: Tue Apr 19, 2011 1:40 pmFollowed by: 11 members
Thanked: 114 times
by knight247 » Tue Jul 12, 2011 10:41 am
Every student of a certain class in a School volunteered to contribute equally for the a picnic. If the total contribution received was $600, how many students were there in the class?
(1)Each student contributed $10
(2)10 students failed to contribute and the remaining students ended up paying $2 more than they would have contributed otherwise.

OA is [spoiler](A)[/spoiler] but I disagree with the OA. In my opinion it is [spoiler](D)[/spoiler]

Lets hear everyone's opinion and then i'll explain my opinion.thanks
Last edited by knight247 on Tue Jul 12, 2011 12:42 pm, edited 1 time in total.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
Legendary Member
Posts: 759
Joined: Mon Apr 26, 2010 10:15 amFollowed by: 3 members
Thanked: 85 times

by clock60 » Tue Jul 12, 2011 11:18 am
agree with D, 2 st is also valid as it gives number of persons=60 and -50, but the number can`t -ve so must be neglected
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY

GMAT/MBA Expert

User avatar
GMAT Instructor
Posts: 3835
Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members
Location: Milpitas, CA
Thanked: 1854 times
GMAT Score:770

by Anurag@Gurome » Tue Jul 12, 2011 7:10 pm
knight247 wrote:Every student of a certain class in a School volunteered to contribute equally for the a picnic. If the total contribution received was $600, how many students were there in the class?
(1)Each student contributed $10
(2)10 students failed to contribute and the remaining students ended up paying $2 more than they would have contributed otherwise.
Say number of students in the class is n and each of them contributed $m for the picnic. Hence, mn = 600

Therefore, number of students in the class, n = 600/m

Statement 1: m = 10 --> n = 600/10 = 60

Sufficient

Statement 2: (n - 10)(m + 2) = 600 --> mn + 2n - 10m = 620
Replacing m = 600/n in the above equation,
  • --> (600/n)n + 2n - 10(600/n) - 620 = 0
    --> 600 + 2n - 6000/n - 620 = 0
    --> 2n - 20 - 6000/n = 0
    --> 2n² - 20n - 6000 = 0
    --> n² - 10n - 3000 = 0
    --> (n - 60)(n + 50) = 0
As n cannot be negative, only possible value of n is 60.

Sufficient

The correct answer is D.
Anurag Mairal, Ph.D., MBA
GMAT Expert, Admissions and Career Guidance
Gurome, Inc.
1-800-566-4043 (USA)

Join Our Facebook Groups
GMAT with Gurome
https://www.facebook.com/groups/272466352793633/
Admissions with Gurome
https://www.facebook.com/groups/461459690536574/
Career Advising with Gurome
https://www.facebook.com/groups/360435787349781/
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1