LBS is Calling R1 Admits - Join Chat Room to Catch the Latest Action
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
we will pick new questions that match your level based on your Timer History
Track Your Progress
every week, we’ll send you an estimated GMAT score based on your performance
Practice Pays
we will pick new questions that match your level based on your Timer History
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
Mark your calendars - All GMAT Club Tests are free and open November 22nd to celebrate Thanksgiving Day! Access will be available from 0:01 AM to 11:59 PM, Pacific Time (USA)
Of the final grades received by the students in a certain
[#permalink]
Show Tags
26 Dec 2012, 06:04
2
5
00:00
A
B
C
D
E
Difficulty:
5% (low)
Question Stats:
94% (01:15) correct 6% (01:51) wrong based on 1034 sessions
HideShow timer Statistics
Of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. What is the number of students in the course?
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
26 Dec 2012, 06:08
4
1
Walkabout wrote:
Of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. What is the number of students in the course?
(A) 80 (B) 110 (C) 160 (D) 200 (E) 400
1/5+1/4+1/2=19/20 of the grades are A, B, or C.
Thus the remaining 10 grades represent 1/20 of the grades. Theretofore there are 20*10=200 students.
Of the final grades received by the students in a certain
[#permalink]
Show Tags
20 Jan 2015, 04:04
1
I guess the more staightforward way to do this is giving a variable for the total number of students, say T:
Then: (1/5)T + (1/4)T + (1/2)T + 10 = T T/5 + T/4 + T/2 + 10 = T (4T + 5T + 10T) / 20 = T - 10 --> we multiplied with the LCM and moved 10 to the other side. 19T = 20 (T - 10) 19T = 20T - 200 T = 200, ANS D
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
20 May 2015, 11:44
1
I would rather use decimals for this question. Grades A:0,2, B:0,25, C:0,5 and the remaining(0,2+0,25+0,5=0,95) 0,05*X=10 --> So, X=200 (D)
_________________
When you’re up, your friends know who you are. When you’re down, you know who your friends are.
Share some Kudos, if my posts help you. Thank you !
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
22 May 2015, 22:33
Hi All,
This question can also be solved by TESTing THE ANSWERS.
We're given data on the "breakdown" of grades in a course: 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. We're asked for the total number of students in the course.
Let's TEST Answer C: 160 students
Total = 160 1/5 are A's = 32 1/4 are B's = 40 1/2 are C's = 80 Sub-total = 152, which leaves 8 students with D's. This is TOO LOW (there are supposed to be 10 students with D's). Thus we need MORE total students. Eliminate Answers A, B and C.
Since 8 is relatively close to 10, we probably don't need that many more students, so let's TEST D next....
Answer D: 200 students
Total = 200 1/5 are A's = 40 1/4 are B's = 50 1/2 are C's = 100 Sub-total = 190, leaving 10 for D's. This is a MATCH for what we were told, so this MUST be the answer.
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
05 Jul 2016, 05:13
Walkabout wrote:
Of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. What is the number of students in the course?
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
07 Jul 2016, 09:17
Walkabout wrote:
Of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. What is the number of students in the course?
(A) 80 (B) 110 (C) 160 (D) 200 (E) 400
We start by creating a variable for the total number of students in the math course. We can say:
T = Total number of students in the math course
Next, we can use variable T in an equation that we translate from the given information. We are given that, of the final grades received by the students in a certain math course, 1/5 are A's, 1/4 are B's, 1/2 are C's, and the remaining 10 grades are D's. Since this represents all the grades in the class, it represents all the students in the class. Thus we know:
#A’s + #B’s + #C’s + #D’s = Total number of students in the class
1/5(T) + ¼(T) + ½(T) + 10 = T
We can multiply the entire equation by 20 to cancel out the denominators of the fractions and we have:
4T + 5T + 10T + 200 = 20T
19T + 200 = 20T
200 = T
There are a total of 200 students in the math class.
Answer is D.
_________________
Jeffery Miller Head of GMAT Instruction
GMAT Quant Self-Study Course 500+ lessons 3000+ practice problems 800+ HD solutions
Re: Of the final grades received by the students in a certain
[#permalink]
Show Tags
12 Mar 2018, 04:23
Hello from the GMAT Club BumpBot!
Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).
Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
close
94% (01:15) correct 
