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.
The average (arithmetic mean) of a, 2a, and 9 is 7
[#permalink]
10 Jun 2017, 02:06
10 Jun 2017, 02:06
Expert Reply
00:00
Question Stats:
86% (00:27) correct
13% (00:30) wrong based on 120 sessions
Hide Show timer Statistics
The average (arithmetic mean) of a, 2a, and 9 is 7
Quantity A |
Quantity B |
5 |
a |
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.
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: The average (arithmetic mean) of a, 2a, and 9 is 7
[#permalink]
30 Jul 2017, 17:35
30 Jul 2017, 17:35
1
Carcass wrote:
The average (arithmetic mean) of a, 2a, and 9 is 7
Quantity A |
Quantity B |
5 |
a |
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.
The average (arithmetic mean) of a, 2a, and 9 = 7
So, (a + 2a + 9)/3 = 7
Multiply both sides by 3 to get: a + 2a + 9 = 21
Simplify: 3a + 9 = 21
Solve: a = 4
So, we have:
Quantity A: 5
Quantity B: 4
Answer: A
RELATED VIDEO
Re: The average (arithmetic mean) of a, 2a, and 9 is 7
[#permalink]
27 Dec 2021, 02:57
27 Dec 2021, 02:57
Expert Reply
