GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 14 Dec 2019, 08:14

### 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

# The average age of three friends A, B and C is 7 years. Five years lat

Author Message
TAGS:

### Hide Tags

VP
Joined: 19 Oct 2018
Posts: 1175
Location: India
The average age of three friends A, B and C is 7 years. Five years lat  [#permalink]

### Show Tags

02 Jun 2019, 22:08
00:00

Difficulty:

55% (hard)

Question Stats:

58% (02:29) correct 42% (02:42) wrong based on 48 sessions

### HideShow timer Statistics

The average age of three friends A, B and C is 7 years. Five years later, the average age of A and C will be 1½ years more than B’s age then. How old will B be 10 years hence (in years)

A. 10
B. 12
C. 14
D. 16
E. 18
Director
Joined: 22 Nov 2018
Posts: 562
Location: India
GMAT 1: 640 Q45 V35
GMAT 2: 660 Q48 V33
Re: The average age of three friends A, B and C is 7 years. Five years lat  [#permalink]

### Show Tags

03 Jun 2019, 04:20
1
A+B+C = 21 years.

5 years later ((A+5)+(b+5))/2 = 1.5+B+5 ; simplifying A+C+10=13+2B ; Adding B on both sides A+B+C = 3+3B; 21 = 3+3B; B= 6. Ten years later b=16
Manager
Joined: 20 Mar 2019
Posts: 50
Location: India
Re: The average age of three friends A, B and C is 7 years. Five years lat  [#permalink]

### Show Tags

03 Jun 2019, 18:24
(A+B+C)/3 = 7

A+B+C = 21

5 Years Later,
(A+C)/2 +5 = 3/2 + B + 5

Since A + B + C = 21 , we know that A+C = 21-B

Replace in above equation,

(21-B)/2 = 3/2 + B
B = 6

10 Years Later,

B =16
Re: The average age of three friends A, B and C is 7 years. Five years lat   [#permalink] 03 Jun 2019, 18:24
Display posts from previous: Sort by