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

It is currently 18 Jan 2019, 05:53

Close

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
Your Progress

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Events & Promotions in January
PrevNext
SuMoTuWeThFrSa
303112345
6789101112
13141516171819
20212223242526
272829303112
Open Detailed Calendar
  • Free GMAT Strategy Webinar

     January 19, 2019

     January 19, 2019

     07:00 AM PST

     09:00 AM PST

    Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
  • FREE Quant Workshop by e-GMAT!

     January 20, 2019

     January 20, 2019

     07:00 AM PST

     07:00 AM PST

    Get personalized insights on how to achieve your Target Quant Score.

Ten years ago, the average age of a couple was 27 years old. Today

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
TAGS:

Hide Tags

 
Manager
Manager
avatar
G
Joined: 29 Nov 2018
Posts: 62
Concentration: Marketing, Strategy
Ten years ago, the average age of a couple was 27 years old. Today  [#permalink]

Show Tags

New post 07 Jan 2019, 10:06
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

81% (01:13) correct 19% (02:09) wrong based on 42 sessions

HideShow timer Statistics

Ten years ago, the average age of a couple was 27 years old. Today also the average age of the couple and their baby is 27 years old. Find the present age of the baby.

A 4
B 3
C 2
D 5
E 7
Manager
Manager
avatar
S
Joined: 09 Mar 2018
Posts: 196
Location: India
Ten years ago, the average age of a couple was 27 years old. Today  [#permalink]

Show Tags

New post 07 Jan 2019, 10:30
cfc198 wrote:
Ten years ago, the average age of a couple was 27 years old. Today also the average age of the couple and their baby is 27 years old. Find the present age of the baby.

A 4
B 3
C 2
D 5
E 7


Couple's age = x+y, Baby's age = z

Ten years Ago,
\(\frac{x+y}{2}\)- 10 =27
x+y-20 = 54
x+y =74

\(\frac{x+y+z}{3}\) =27
x+y+z = 81
z = 7

Correct Answer E
_________________

If you notice any discrepancy in my reasoning, please let me know. Lets improve together.

Quote which i can relate to.
Many of life's failures happen with people who do not realize how close they were to success when they gave up.

Intern
Intern
avatar
B
Joined: 25 Dec 2018
Posts: 15
Re: Ten years ago, the average age of a couple was 27 years old. Today  [#permalink]

Show Tags

New post 09 Jan 2019, 01:02
cfc198 wrote:
Ten years ago, the average age of a couple was 27 years old. Today also the average age of the couple and their baby is 27 years old. Find the present age of the baby.

A 4
B 3
C 2
D 5
E 7


Couple's age = x+y, Baby's age = z

Ten years Ago,
x+y =27 * 2
x+y= 54

after 10 years

(x+10)+(y+10)+z =27 * 3
x+y+z = 81
z = 7

Correct Answer E
Manager
Manager
avatar
B
Joined: 18 Oct 2018
Posts: 51
Location: India
Concentration: Finance, International Business
GPA: 4
WE: Business Development (Retail Banking)
Re: Ten years ago, the average age of a couple was 27 years old. Today  [#permalink]

Show Tags

New post 09 Jan 2019, 10:44
Sum of age of parents,10 years ago= 27*2=54
Therefore, some of age of parents today= 54+10+10 =74 (adding 10 years to the age of both of the parent)
But today, age of parents and child average to 27 years.
So, sum of the ages of the three,today=27*3=81
Thus, age of child= age of all three-age of parents= 81-74=7

Hence, E
Veritas Prep GMAT Instructor
User avatar
D
Joined: 16 Oct 2010
Posts: 8790
Location: Pune, India
Re: Ten years ago, the average age of a couple was 27 years old. Today  [#permalink]

Show Tags

New post 09 Jan 2019, 21:20
cfc198 wrote:
Ten years ago, the average age of a couple was 27 years old. Today also the average age of the couple and their baby is 27 years old. Find the present age of the baby.

A 4
B 3
C 2
D 5
E 7


Use the concept of deviation to solve it in seconds.

Th average age of two people was 27 so they were effectively 27 years old each.
After 10 yrs, there was an extra 20 yrs deviation but average remained same so there must have been a shortfall of 20 too. The shortfall would come from the child's age so the child must be 27 - 20 = 7 years old.

Answer (E)

To learn more about this concept, check out our blog: https://www.veritasprep.com/blog/2012/0 ... eviations/
_________________

Karishma
Veritas Prep GMAT Instructor

Learn more about how Veritas Prep can help you achieve a great GMAT score by checking out their GMAT Prep Options >

GMAT Club Bot
Re: Ten years ago, the average age of a couple was 27 years old. Today &nbs [#permalink] 09 Jan 2019, 21:20
Display posts from previous: Sort by

Ten years ago, the average age of a couple was 27 years old. Today

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  


Copyright

GMAT Club MBA Forum Home| About| Terms and Conditions and Privacy Policy| GMAT Club Rules| Contact| Sitemap

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne

Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.