|
|
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.
22 Nov 2019, 03:35
Kudos
Bookmarks
E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
82% (02:15) correct
18%
(02:40)
wrong
based on 261
sessions
History
Date
Time
Result
Not Attempted Yet
A certain class of 90 students took a typing proficiency test. The average (arithmetic mean) score of the students who passed the test was 84, and the average score of the students who failed the test was 60. If the average score of all students was 80, how many students passed the test?
A. 15
B. 20
C. 42
D. 70
E. 75
A. 15
B. 20
C. 42
D. 70
E. 75
Archit3110
22 Nov 2019, 04:36
Kudos
Bookmarks
p+f=90
total score = 90*80 ; 7200
84*p+60*(90-p) = 7200
p = 75
IMO E
total score = 90*80 ; 7200
84*p+60*(90-p) = 7200
p = 75
IMO E
Bunuel
Manicks
Joined: 17 Aug 2019
Last visit: 07 Jan 2025
Posts: 10
Own Kudos:
Given Kudos: 55
Location: Singapore
Concentration: Finance, General Management
Schools: SMU MAF "21 (A)
GMAT 1: 620 Q46 V30
WE:Analyst (Commercial Banking)
03 Jan 2020, 22:47
Kudos
Bookmarks
Total score of all students = 80 * 90 = 7200
Since the avg. score of students who passed the test is 84, the number students who passed the test must end with a 5.
Therefore, only option A. 15 or option E.75 is possible.
We can rule out 15 as it would shift the avg. away from 80.
Ans: E. 75
Since the avg. score of students who passed the test is 84, the number students who passed the test must end with a 5.
Therefore, only option A. 15 or option E.75 is possible.
We can rule out 15 as it would shift the avg. away from 80.
Ans: E. 75
