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 →

and Lucy took a math test

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760
by sanju09 » Sun Jun 29, 2014 12:24 am
Marry, Dora, Christie, and Lucy took a math test of total 50 marks. Christie scored 4 marks less than Marry scored and Dora scored 10 marks more than Lucy scored. If the average (arithmetic mean) of their scored marks is same as what Dora scored in the test, how many marks did Christie score in the test?
(1) Marry and Dora together scored 83 marks in the test.
(2) Christie and Lucy together scored 69 marks in the test.


Made Up!
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Data Sufficiency |
User avatar
Legendary Member
Posts: 1100
Joined: Sat May 10, 2014 11:34 pmFollowed by: 24 members
Location: New Delhi, India
Thanked: 205 times

by GMATinsight » Sun Jun 29, 2014 5:26 am
Marry, Dora, Christie, and Lucy took a math test of total 50 marks. Christie scored 4 marks less than Marry scored and Dora scored 10 marks more than Lucy scored. If the average (arithmetic mean) of their scored marks is same as what Dora scored in the test, how many marks did Christie score in the test?
(1) Marry and Dora together scored 83 marks in the test.
(2) Christie and Lucy together scored 69 marks in the test.
Christie =C
Marry = M
Dora = D
Lucy = L

Now, C = M-4 ==> M = C+4
D = L+10 ==> L = D-10
(C+M+L+D)/4 = D ==> C+M+L = 3D ==> C+(C+4)+(D-10) = 3D ==> 2C-6 = 2D ==> D=C-3
C=?

Statement 1) M+D = 83 ==>(C+4) +D = 83 ==>(C+4)+(C-3)=83 ==> C=41 Sufficient
Sufficient

Statement 2) C+L = 69 ==> C+(D-10)=69 ==> C+(C-3)-10 = 69 ==> C=41 Sufficient

Answer: Option-D
"GMATinsight"Bhoopendra Singh & Sushma Jha
Most Comprehensive and Affordable Video Course 2000+ CONCEPT Videos and Video Solutions
Whatsapp/Mobile: +91-9999687183 l [email protected]
Contact for One-on-One FREE ONLINE DEMO Class Call/e-mail
Most Efficient and affordable One-On-One Private tutoring fee - US$40-50 per hour
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Senior | Next Rank: 100 Posts
Posts: 31
Joined: Thu Jun 04, 2009 12:01 am
Thanked: 1 times

by unknown13 » Mon Jun 30, 2014 10:33 pm
Hi
Got the answer as D

but took more time for solving this simple question

thanks and regards
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
GMAT Instructor
Posts: 3650
Joined: Wed Jan 21, 2009 4:27 amFollowed by: 80 members
Location: India
Thanked: 267 times
GMAT Score:760

by sanju09 » Tue Jul 01, 2014 12:02 am
unknown13 wrote:Hi
Got the answer as D

but took more time for solving this simple question

thanks and regards
In a DS problem, we don't really need to finish the calculation. The moment we feel a unique answer may or may not be reached, we should STOP, take DECISION, and save the precious TIME.
The mind is everything. What you think you become. -Lord Buddha



Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
Lucknow-226001

www.manyagroup.com
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1