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.
If a group of students having an average age of 17 years join a class,
[#permalink]
04 Jan 2024, 00:02
04 Jan 2024, 00:02
Expert Reply
1
Bookmarks
00:00
Question Stats:
60% (01:47) correct
40% (02:19) wrong based on 5 sessions
Hide Show timer Statistics
If a group of students having an average age of 17 years join a class, the average age of all the students in the class reduces from 20 years to 19 years.
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
Twice the number of students who joined the class |
The number of students initially present in the class |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Part of the project: The Butler-GRE Daily New Quant and Verbal Questions to Practice (2023) - Gain 20 Kudos & Get FREE Access to GRE Prep Club TESTS
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Free Materials for the GRE General Exam - Where to get it!!
GRE Geometry Formulas
GRE - Math Book
Manager
Joined: 11 Nov 2023
Posts: 207
Given Kudos: 76
WE:Business Development (Advertising and PR)
Re: If a group of students having an average age of 17 years join a class,
[#permalink]
19 Jan 2024, 14:26
19 Jan 2024, 14:26
1
Let b = the # of students who joined the class, c = the # of students who were initially in the class.
20a = the total combined years of ages in the initial class
17x = the total combined years of ages in the group of students who joined
Given that the new average of all the students is 19:
\(\frac{{17x + 20a} }{ {x + a}} = 19\)
\(17x +20a = 19x +19x\)
\(a = 2x\)
20a = the total combined years of ages in the initial class
17x = the total combined years of ages in the group of students who joined
Given that the new average of all the students is 19:
\(\frac{{17x + 20a} }{ {x + a}} = 19\)
\(17x +20a = 19x +19x\)
\(a = 2x\)
gmatclubot
Re: If a group of students having an average age of 17 years join a class, [#permalink]
19 Jan 2024, 14:26
Moderators:
