It is currently 20 May 2019, 22:30

### 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

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

# Four people have an average (arithmetic mean) age of 18, and

Author Message
TAGS:
GRE Prep Club Legend
Joined: 07 Jun 2014
Posts: 4857
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 111

Kudos [?]: 1854 [2] , given: 397

Four people have an average (arithmetic mean) age of 18, and [#permalink]  30 Aug 2018, 07:30
2
KUDOS
Expert's post
00:00

Question Stats:

59% (00:48) correct 40% (00:22) wrong based on 54 sessions
Four people have an average (arithmetic mean) age of 18, and none of the people are older than 30.

 Quantity A Quantity B The range of the four people’s ages $$25$$

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.
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Intern
Joined: 02 Sep 2018
Posts: 8
Followers: 0

Kudos [?]: 4 [0], given: 1

Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]  03 Sep 2018, 05:21
I think ans is B
Intern
Joined: 28 Aug 2018
Posts: 19
GRE 1: Q170 V166
WE: Other (Education)
Followers: 0

Kudos [?]: 15 [0], given: 0

Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]  03 Sep 2018, 15:45
D

Since there's an upper limit of 30, the range is determined by the lowest age possible. We get this case when 2 people are 30, then the other 2 people have a combined age of 12. In the most extreme case, the lowest age is then 1, and then the range is 29, greater than 25, but in another extreme case, the other 2 people are both 6 so the range is 30-6=24 which is less than 25. So cannot be determined
_________________

Dartmouth Engineer, GRE 336/340 (Q:170, V:166).

Ask Me Questions/Get More Resources at

gregory.education

Intern
Joined: 27 Aug 2018
Posts: 36
Followers: 0

Kudos [?]: 16 [0], given: 7

Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]  04 Sep 2018, 18:38
D. It cannot be determined from the information given. We can't calculate the range of the four people's ages. Eliminate A. Range can be equal to 25 if one person's age is 1 and second's 26. It can be greater than 25 if the second person's age is 27. Eliminate B and C.
Intern
Joined: 02 Jul 2018
Posts: 9
Followers: 0

Kudos [?]: 6 [0], given: 1

Re: Four people have an average (arithmetic mean) age of 18, and [#permalink]  05 Sep 2018, 01:35
the average of ages of four people is 18, meaning the sum of the ages is 72.

Case 1 - max age = 30 min age = 1 => range is 29 which is greater than 25
Case 2 - consider the following ages: 15,15,21,21 => the range is only 6 which is less than 25

Hence there is no clear way we can identify which one is bigger. So answer is D
Re: Four people have an average (arithmetic mean) age of 18, and   [#permalink] 05 Sep 2018, 01:35
Display posts from previous: Sort by