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

 It is currently 20 Oct 2019, 00:34

### 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 a family of 5 members is 20 years. If the age of th

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 58445
The average age of a family of 5 members is 20 years. If the age of th  [#permalink]

### Show Tags

21 Feb 2019, 00:16
00:00

Difficulty:

35% (medium)

Question Stats:

70% (01:40) correct 30% (01:40) wrong based on 10 sessions

### HideShow timer Statistics

The average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member?

A. 9.5
B. 10.5
C. 11.5
D. 12.5
E. 13.5

_________________
GMAT Club Legend
Joined: 18 Aug 2017
Posts: 5021
Location: India
Concentration: Sustainability, Marketing
GPA: 4
WE: Marketing (Energy and Utilities)
Re: The average age of a family of 5 members is 20 years. If the age of th  [#permalink]

### Show Tags

21 Feb 2019, 08:35
Bunuel wrote:
The average age of a family of 5 members is 20 years. If the age of the youngest member be 10 years then what was the average age of the family at the time of the birth of the youngest member?

A. 9.5
B. 10.5
C. 11.5
D. 12.5
E. 13.5

so total age of family = 5*20 ; 100
now age of youngest member = 10
and at time of birth of youngest member all members age will be reduced by 10 each or say 10*5 ; 50
so 100-50 = 50
avg of family then ; 50/4 ; 12.5 IMO D
Re: The average age of a family of 5 members is 20 years. If the age of th   [#permalink] 21 Feb 2019, 08:35
Display posts from previous: Sort by