Events & Promotions
|
|
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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Sep 0609:30 AM EDT
-12:30 PM EST
Top scores are possible when you enroll in a powerful EA course, taught live online + 6 months access to TTP OnDemand video courses included! Perfect class schedule and easy course access for working professionals. Class starts Sundays Sept. 6, 2026.
Sep 0201:00 PM EDT
-11:59 PM EDT
Take 30% off all study plans with code COURSEWORK - Expires on Monday 9/7
Sep 0410:00 AM EDT
-11:59 PM EDT
We’ve worked incredibly hard to build TTP into the best test prep experience possible, and it would mean a lot to us to win Newsweek’s 2026 Readers’ Choice Award for Best Test Prep. If TTP has helped you, we’d be incredibly grateful for your vote.
Sep 0712:01 AM PDT
-11:59 PM PDT
On the 7th, GMAT Club Tests will be Free! Including all the Quizzes, Questions, and Tests. 12 AM - 11:59 PM PDT- Sep 07
10:00 AM PDT
-11:00 AM PDT
A complete walkthrough of GMAT Club’s free 12-week GMAT study plan: what you study each week, how progress and goals are tracked, how the error log works, and how your practice unlocks paid tools at no cost. - Sep 09
07:00 AM PDT
-10:00 AM PDT
Meet AdComs and explore top Master’s programs - MiM, MiF, MSc, MSBA and more. - Application Fee Waivers - Free 1-Week of GMAT Club Tests: - Master's Application Toolkit - Grand Prize Giveaway - Sep 09
10:00 AM PDT
-11:00 AM PDT
Three MBA applications. Three rejections. No interview invites. A year later, Aman was admitted to Cambridge Judge, SMU, and IMD. In this episode of MBA Admit Stories, Aman shares how he rebuilt his MBA application... 
Sep 1507:00 PM EDT
-09:00 PM EST
Elite scores are possible when you enroll in a powerful GMAT course, taught live online + 6 months access to TTP OnDemand video courses included! Class starts Tues/Thurs Sept. 15, 2026 - Nov. 15, 2027, 7:00pm-9:00pm EST
Sep 2108:00 PM EDT
-10:00 PM EDT
Boost your GMAT score in less than one month in a live online class + 6 months access to TTP OnDemand video courses included! Class starts Mon, Tues, Wed, Thur, Fri Sept. 21, 2026 - Oct. 9, 2027, 7:00pm-10:00pm EST
25 May 2026, 19:00
Kudos
Bookmarks
D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
71% (01:23) correct
29%
(01:25)
wrong
based on 84
sessions
History
Date
Time
Result
Not Attempted Yet
At a training center, 4 interns and 6 mentors took the same certification test. What was the average (arithmetic mean) score of all 10 test-takers?
(1) The total score of the mentors was 180 points, and the average score of the interns was 5 points less than the average score of the mentors.
(2) If one of the interns had scored 20 points more, the average score of all 10 test-takers would have been 30.
(1) The total score of the mentors was 180 points, and the average score of the interns was 5 points less than the average score of the mentors.
(2) If one of the interns had scored 20 points more, the average score of all 10 test-takers would have been 30.
Experience GMAT Club Test Questions
Yes, you've landed on a GMAT Club Tests question
Craving more? Unlock our full suite of GMAT Club Tests here
Want to experience more? Get a taste of our tests with our free trial today
Rise to the challenge with GMAT Club Tests. Happy practicing!
M47-170
03 Jun 2026, 01:00
Kudos
Bookmarks
GMAT Club Official Solution:
At a training center, 4 interns and 6 mentors took the same certification test. What was the average (arithmetic mean) score of all 10 test-takers?
The question asks for the average score of all 10 test-takers.
(1) The total score of the mentors was 180 points, and the average score of the interns was 5 points less than the average score of the mentors.
Since there were 6 mentors, the mentors’ average score was:
180/6 = 30
The interns’ average score was 5 points less, so:
30 - 5 = 25
Since there were 4 interns, their total score was:
4 * 25 = 100
So the total score of all 10 test-takers was:
180 + 100 = 280
Therefore, the average score was:
280/10 = 28
Sufficient.
Alternatively, after finding the two group averages, we can reason as follows:
The ratio of the number of interns to the number of mentors is:
4:6 = 2:3
So the overall average is between 25 and 30, and its distances from the two group averages are in the reverse ratio:
3:2
The difference between the two group averages is:
30 - 25 = 5
So the 5-point gap is split into 3 parts and 2 parts. Each part is 1 point.
Thus, the overall average is:
25 + 3 = 28
(2) If one of the interns had scored 20 points more, the total score of the group would have increased by 20.
Since there were 10 test-takers, the group average would have increased by:
20/10 = 2
The new average would have been 30, so the actual average was:
30 - 2 = 28
Sufficient.
Each statement alone is sufficient.
Answer: D.
At a training center, 4 interns and 6 mentors took the same certification test. What was the average (arithmetic mean) score of all 10 test-takers?
The question asks for the average score of all 10 test-takers.
(1) The total score of the mentors was 180 points, and the average score of the interns was 5 points less than the average score of the mentors.
Since there were 6 mentors, the mentors’ average score was:
180/6 = 30
The interns’ average score was 5 points less, so:
30 - 5 = 25
Since there were 4 interns, their total score was:
4 * 25 = 100
So the total score of all 10 test-takers was:
180 + 100 = 280
Therefore, the average score was:
280/10 = 28
Sufficient.
Alternatively, after finding the two group averages, we can reason as follows:
The ratio of the number of interns to the number of mentors is:
4:6 = 2:3
So the overall average is between 25 and 30, and its distances from the two group averages are in the reverse ratio:
3:2
The difference between the two group averages is:
30 - 25 = 5
So the 5-point gap is split into 3 parts and 2 parts. Each part is 1 point.
Thus, the overall average is:
25 + 3 = 28
(2) If one of the interns had scored 20 points more, the total score of the group would have increased by 20.
Since there were 10 test-takers, the group average would have increased by:
20/10 = 2
The new average would have been 30, so the actual average was:
30 - 2 = 28
Sufficient.
Each statement alone is sufficient.
Answer: D.
General Discussion
BongBideshini
Joined: 25 May 2021
Last visit: 05 Sep 2026
Posts: 390
Own Kudos:
Given Kudos: 137
Location: India
Concentration: Entrepreneurship, Marketing
Schools: HBS '27 Stanford '27 Wharton '27 Sloan '27
GPA: 3.8
WE:Engineering (Government)
26 May 2026, 00:05
Kudos
Bookmarks
Statement (1)
m = 180/6 = 30
Intern average i = 30 − 5 = 25
Total score of all 10 people: 30 x 6 + 25 x 4
180 + 100 = 280
Average: 280/10 = 28
Statement (1) alone is sufficient.
Statement (2)
If one intern had scored 20 more points,
The overall average would become 30.
That means the total score would become:
10 × 30 = 300
So the actual total score must have been:
300 − 20 = 280
Actual average:
280/10 = 28
Statement (2) alone is sufficient.
Answer: D
m = 180/6 = 30
Intern average i = 30 − 5 = 25
Total score of all 10 people: 30 x 6 + 25 x 4
180 + 100 = 280
Average: 280/10 = 28
Statement (1) alone is sufficient.
Statement (2)
If one intern had scored 20 more points,
The overall average would become 30.
That means the total score would become:
10 × 30 = 300
So the actual total score must have been:
300 − 20 = 280
Actual average:
280/10 = 28
Statement (2) alone is sufficient.
Answer: D
Bunuel
