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

Redeem

Target Test Prep · GMAT

Choose how you want to prepare

Learn live with an expert or move at your own pace. Every option includes the complete TTP study system.

★★★★★5.0559 reviews
GMATLiveTeach Starts Oct 17
Chris Peckover, Target Test Prep GMAT expert
LIVE ONLINE CLASSES

Get Ready for GMAT Test Day Faster with Live Online Classes

with Chris Peckover, 100th-Percentile GMAT Scorer

Oct 17 · Chris Peckover
Sat · 11:00 AM to 2:00 PM ET
Oct 20 · Chris Peckover
Tue, Thu · 8:00 to 10:00 PM ET
Oct 25 · Josh Braslow
Sun · 1:00 to 4:00 PM ET
Included
40 hours of live online classes + 6 months of TTP OnDemand
  • Attend the first class for free
  • Every class is recorded, so you never fall behind
View classes & enroll
Limited seats availableTarget Test Prep
EALiveTeachOnDemand 5 seats left Start anytime
EXECUTIVE ASSESSMENT

Target Test Prep EA OnDemand

Self-paced EA prep. Study on your schedule.

Logan Thompson
EXECUTIVE ASSESSMENT

Sep 6 to Dec 6, 2026

with Logan Thompson

165+ EA score guarantee
$05-day trial no automatic billing
Schedule
Sun · 9:30 AM to 12:30 PM ET
Included
40 hours of live online classes plus six months of access to the complete TTP EA OnDemand course.
  • 165+ EA Score Guarantee
  • 4,100+ Quant, Verbal, and Integrated Reasoning practice questions
  • 400+ hours of in-depth video lessons
  • 3,000+ step-by-step video solutions
View EA class & enroll Start free 5-day trial
Limited cohort · enrollment openTrial includes full course accessTarget Test Prep
GMATOnDemand Start anytime
SELF-PACED MASTERCLASS

Target Test Prep GMAT OnDemand

Complete access from day one. Study on your schedule.

715+ score guarantee
$0to start then $127/mo
  • Personalized study plan and analytics
  • Thousands of lessons and practice questions
Start free 5-day trial
Read 559 reviewsTarget Test Prep

Compare the format, schedule, and included access before enrolling. Prices and seat counts shown reflect the supplied offer details.

Question 33 - Help please :)

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Sat Nov 08, 2008 1:57 pm
Location: Planet Earth
by aparna312 » Sat Nov 15, 2008 9:13 pm
I'm not getting the right answer. I'm sure I'm missing something basic here but please help:

A teacher gave the same test to three history classes: A, B, and C. The average (arithmetic mean) scores for the three classes were 65, 80, and 77 respectively. The ratio of the numbers of students in each class who took the test was 4 to 6 to 5, respectively. What was the average score for the three classes combined?

A. 74
B. 75
C. 76
D. 77
E. 78

** Answer: B. 75 **
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 940
Joined: Tue Aug 26, 2008 3:22 amFollowed by: 1 member
Thanked: 55 times

Re: Question 33 - Help please :)

by iamcste » Sat Nov 15, 2008 9:20 pm
aparna312 wrote:I'm not getting the right answer. I'm sure I'm missing something basic here but please help:

A teacher gave the same test to three history classes: A, B, and C. The average (arithmetic mean) scores for the three classes were 65, 80, and 77 respectively. The ratio of the numbers of students in each class who took the test was 4 to 6 to 5, respectively. What was the average score for the three classes combined?

A. 74
B. 75
C. 76
D. 77
E. 78

** Answer: B. 75 **

Avg=((65*4)+(80*6)+(77*5))/(4+6+5)=75
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Legendary Member
Posts: 940
Joined: Tue Aug 26, 2008 3:22 amFollowed by: 1 member
Thanked: 55 times

Re: Question 33 - Help please :)

by iamcste » Sat Nov 15, 2008 9:21 pm
iamcste wrote:
aparna312 wrote:I'm not getting the right answer. I'm sure I'm missing something basic here but please help:

A teacher gave the same test to three history classes: A, B, and C. The average (arithmetic mean) scores for the three classes were 65, 80, and 77 respectively. The ratio of the numbers of students in each class who took the test was 4 to 6 to 5, respectively. What was the average score for the three classes combined?

A. 74
B. 75
C. 76
D. 77
E. 78

** Answer: B. 75 **

Avg=((65*4)+(80*6)+(77*5))/(4+6+5)=75

Avg=sum(n items)=n

Class A: we know the Avg and no of students hence we can get total marks of all the students

similarly for other classes

and use Avg forumala
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Sat Nov 08, 2008 1:57 pm
Location: Planet Earth

by aparna312 » Sat Nov 15, 2008 9:32 pm
Hey... Thanks a ton. Appreciate the swift response.

Guess that proves it.... my math is deplorable :)
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Master | Next Rank: 500 Posts
Posts: 106
Joined: Thu May 22, 2008 10:50 am
Thanked: 3 times

by EricLien9122 » Sat Nov 15, 2008 11:32 pm
just curious, what's the source of this question? I always thought the actual GMAT would have easier number for weighted average calculation.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
User avatar
Legendary Member
Posts: 871
Joined: Wed Aug 13, 2008 7:48 am
Thanked: 48 times

by stop@800 » Sun Nov 16, 2008 2:15 am
EricLien9122 wrote:just curious, what's the source of this question? I always thought the actual GMAT would have easier number for weighted average calculation.
As per gmat these calculations are easier....
65 * 4 = 260
80 * 6 = 480
77 * 5 = 385

can be done without paper pencil....
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Newbie | Next Rank: 10 Posts
Posts: 4
Joined: Sat Nov 08, 2008 1:57 pm
Location: Planet Earth

by aparna312 » Sun Nov 16, 2008 11:32 am
Hey,

Its not that complicated (a regular prob I guess)... I was just being a lil obtuse :)

Its just from a set of test papers I got from a friend - don't know if its from any book bu the problems are quite interesting.
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1