GRE Prep 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.
Mr. Choudury’s fourth-grade class consists of 20 students:
[#permalink]
27 May 2018, 03:49
27 May 2018, 03:49
Expert Reply
1
Bookmarks
00:00
Question Stats:
85% (01:02) correct
14% (00:32) wrong based on 54 sessions
Hide Show timer Statistics
Mr. Choudury’s fourth-grade class consists of 20 students: 12 boys and 8 girls. If the boys weigh an average of 80 pounds each and the girls weigh an average of 70 pounds each, what is the average weight, in pounds, of all 20 students?
(A) 71
(B) 74
(C) 75
(D) 76
(E) 79
(A) 71
(B) 74
(C) 75
(D) 76
(E) 79
Re: Mr. Choudury’s fourth-grade class consists of 20 students:
[#permalink]
27 May 2018, 12:56
27 May 2018, 12:56
Expert Reply
Explanation
The most straightforward approach is to determine the total weight of all 20 students, and divide that total by 20:
12 boys × 80 pounds per boy = 960 pounds
8 girls × 70 pounds per girl = 560 pounds
Total = 1,520 pounds
\(\frac{1520}{20}=76\)
Alternatively, many or even most GRE multiple-choice weighted average problems have the same five answers:
Much closer to the lesser value
A little closer to the lesser value
The unweighted average of the two values
A little closer to the greater value
Much closer to the greater value
Any of these five choices could be correct, but the correct answer is usually “a little closer to the lesser value” or “a little closer to the greater value.” In this case, because there are a few more boys than girls, the avergae for the whole class will be a little closer to the boys’ average weight than to the girls’.
The most straightforward approach is to determine the total weight of all 20 students, and divide that total by 20:
12 boys × 80 pounds per boy = 960 pounds
8 girls × 70 pounds per girl = 560 pounds
Total = 1,520 pounds
\(\frac{1520}{20}=76\)
Alternatively, many or even most GRE multiple-choice weighted average problems have the same five answers:
Much closer to the lesser value
A little closer to the lesser value
The unweighted average of the two values
A little closer to the greater value
Much closer to the greater value
Any of these five choices could be correct, but the correct answer is usually “a little closer to the lesser value” or “a little closer to the greater value.” In this case, because there are a few more boys than girls, the avergae for the whole class will be a little closer to the boys’ average weight than to the girls’.
Re: Mr. Choudurys fourth-grade class consists of 20 students:
[#permalink]
03 Nov 2022, 04:47
03 Nov 2022, 04:47
Hello from the GRE Prep Club BumpBot!
Thanks to another GRE Prep 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.
Thanks to another GRE Prep 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.
