Last visit was: 24 Apr 2026, 12:37 It is currently 24 Apr 2026, 12:37
Home
Messages
Tests
Schools
Events
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.
Go to My Error Log Learn more
Close
Request Expert Reply
Confirm Cancel
Back to Forum
Create Topic
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 24 Apr 2026
Posts: 109,820
Own Kudos:
811,058
Given Kudos: 105,873
Products:
GMAT Club Tests Forum Quiz
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 109,820
Kudos: 811,058
A mother, who is 37 years old, and her son, who is 9 years old, have 21 Mar 2018, 23:12
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

5% (low)

Question Stats:

89% (01:02) correct 11% (01:03) wrong based on 77 sessions

History

Date
Time
Result
Not Attempted Yet
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
ShowHide Answer
Official Answer
C
avatar
Consumer
avatar
Joined: 14 Mar 2018
Last visit: 21 May 2018
Posts: 8
Own Kudos:
12
Given Kudos: 2
Posts: 8
Kudos: 12
A mother, who is 37 years old, and her son, who is 9 years old, have 21 Mar 2018, 23:25
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
Show more

Checking answers
37 + 19 = 2* (9 + 19)
56 = 2 * 28
C
User avatar
DavidTutorexamPAL
User avatar
examPAL Representative
Joined: 07 Dec 2017
Last visit: 09 Sep 2020
Posts: 1,002
Own Kudos:
2,042
Given Kudos: 26
Posts: 1,002
Kudos: 2,042
A mother, who is 37 years old, and her son, who is 9 years old, have 22 Mar 2018, 01:05
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
Show more

As it is easy to translate the question into an equation, we'll do so.
This is a Precise approach.

In x years, the mother will be 37 + x years old and the son 9 + x years old.
So, we need to solve 37+x = 2(9+x) --> 37+x = 18+2x --> 19 = x

(C) is our answer.
User avatar
generis
User avatar
Senior SC Moderator
Joined: 22 May 2016
Last visit: 18 Jun 2022
Posts: 5,258
Own Kudos:
37,728
 [1]
Given Kudos: 9,464
Expert
Expert reply
Posts: 5,258
Kudos: 37,728
 [1]
A mother, who is 37 years old, and her son, who is 9 years old, have 22 Mar 2018, 17:58
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
Show more
Answer choices are fast, especially if the equation is elusive.

Mom is 37
Son is 9
Add the years to each person's age. Correct answer has
Mom's age = 2 * son's age

(A) 11
Mom: 37 + 11 = 46
Son: 9 + 11 = 20
46 is not (2 * 20) - NO

(B) 15
Mom: 37 + 15 = 52
Son: 9 + 15 = 24
52 is not (2 * 24) - NO

(C) 19
Mom: 37 + 19 = 56
Son: 9 + 19 = 28
CORRECT: 56 = (2 * 28) YES

This question does not have VIC. There is only one right answer. That's C. In case you were to start with E . .

(D) 23
Mom: 37 + 23 = 60
Son: 9 + 23 = 32
60 is not (2 * 32) - NO

(E) 28
Mom: 37 + 28 = 65
Son: 9 + 28 = 37
65 is not (2 * 37) - NO

Answer C
User avatar
Mo2men
User avatar
Joined: 26 Mar 2013
Last visit: 09 May 2023
Posts: 2,426
Own Kudos:
1,508
Given Kudos: 641
Concentration: Operations, Strategy
Schools: Erasmus (II)
Products:
My Reviews
Schools: Erasmus (II)
Posts: 2,426
Kudos: 1,508
A mother, who is 37 years old, and her son, who is 9 years old, have 23 Mar 2018, 10:24
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
Show more

Let future years = x

37 + x = 2 (9 + x)

37 + x = 18 +2x

x =19

Answer: C
User avatar
JeffTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 04 Mar 2011
Last visit: 05 Jan 2024
Posts: 2,974
Own Kudos:
8,711
Given Kudos: 1,646
Status:Head GMAT Instructor
Affiliations: Target Test Prep
Expert
Expert reply
Posts: 2,974
Kudos: 8,711
A mother, who is 37 years old, and her son, who is 9 years old, have 23 Mar 2018, 12:43
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
A mother, who is 37 years old, and her son, who is 9 years old, have the same birthday anniversary month and day. In how many years from now will the mother be twice as old as her son?

(A) 11
(B) 15
(C) 19
(D) 23
(E) 28
Show more

Let x = the number of years from now the mother will be twice as old as her son. At that time in the future, she will be (37 + x) years old, and her son will be (x + 9) years old. Also, she will then be twice his age. We can create the following equation:

37 + x = 2(x + 9)

37 + x = 2x + 18

19 = x

Answer: C
User avatar
EgmatQuantExpert
User avatar
e-GMAT Representative
Joined: 04 Jan 2015
Last visit: 02 Apr 2024
Posts: 3,657
Own Kudos:
20,880
Given Kudos: 165
Expert
Expert reply
Posts: 3,657
Kudos: 20,880
A mother, who is 37 years old, and her son, who is 9 years old, have 26 Mar 2018, 09:22
Kudos
Add Kudos
Bookmarks
Bookmark this Post

Solution:



Given:
    • Age of mother = \(37\) years

    • Age of Son = \(9\) years

    • Both have same birthday month and day

      o Inference: Difference in ages = \(37-9 = 28\) years

Working out:

    • We need the age of the mother to be twice that of his son.

    • Let us assume that after x years, the mother will be twice the age as her son.

      o If we translate this statement into a mathematical equation, we get:

         \(37+x = 2* (9+x)\)

Simplifying the equation, we have:

\(37 +x = 18 + 2x\)

Or, \(x = 19\) years

Answer: Option C
Moderators:
Bunuel
Math Expert
109820 posts
Krunaal
Tuck School Moderator
853 posts