Last visit was: 24 Apr 2026, 16:16 It is currently 24 Apr 2026, 16:16
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: 109,818
Own Kudos:
811,077
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: 109,818
Kudos: 811,077
Toshi is 7 years older than his brother Kosuke, who is twice as old as 03 Jul 2019, 23:46
Kudos
Add Kudos
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
D
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:

93% (00:38) correct 7% (00:37) wrong based on 44 sessions

History

Date
Time
Result
Not Attempted Yet
Toshi is 7 years older than his brother Kosuke, who is twice as old as their younger sister Junko. If Junko is 8 years old, how old is Toshi?

A. 17
B. 19
C. 21
D. 23
E. 25
ShowHide Answer
Official Answer
D
User avatar
Kinshook
User avatar
Major Poster
Joined: 03 Jun 2019
Last visit: 24 Apr 2026
Posts: 5,986
Own Kudos:
5,859
Given Kudos: 163
Location: India
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
WE:Engineering (Transportation)
Products:
My Reviews
Schools: HBS '26 CBS '26 Wharton '26
GMAT 1: 690 Q50 V34
Posts: 5,986
Kudos: 5,859
Toshi is 7 years older than his brother Kosuke, who is twice as old as 04 Jul 2019, 01:07
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Toshi is 7 years older than his brother Kosuke, who is twice as old as their younger sister Junko. If Junko is 8 years old, how old is Toshi?

A. 17
B. 19
C. 21
D. 23
E. 25
Show more

Toshi's age = 25 satisfies Koshuke = 16 years and Junko = 8 years old conditions

IMO E
User avatar
Archit3110
User avatar
Major Poster
Joined: 18 Aug 2017
Last visit: 24 Apr 2026
Posts: 8,629
Own Kudos:
5,190
 [2]
Given Kudos: 243
Status:You learn more from failure than from success.
Location: India
Concentration: Sustainability, Marketing
GMAT Focus 1: 545 Q79 V79 DI73
GMAT Focus 2: 645 Q83 V82 DI81
GPA: 4
WE:Marketing (Energy)
Products:
GMAT Club Tests Forum Quiz
GMAT Focus 2: 645 Q83 V82 DI81
Posts: 8,629
Kudos: 5,190
 [2]
Toshi is 7 years older than his brother Kosuke, who is twice as old as 04 Jul 2019, 03:21
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Toshi is 7 years older than his brother Kosuke, who is twice as old as their younger sister Junko. If Junko is 8 years old, how old is Toshi?

A. 17
B. 19
C. 21
D. 23
E. 25
Show more

given
T=7+K
K=2J
J=8
so K = 16
and T= 16+7 ; 23
IMO D
User avatar
CrackverbalGMAT
User avatar
Major Poster
Joined: 03 Oct 2013
Last visit: 24 Apr 2026
Posts: 4,846
Own Kudos:
9,182
Given Kudos: 226
Affiliations: CrackVerbal
Location: India
Expert
Expert reply
Posts: 4,846
Kudos: 9,182
Toshi is 7 years older than his brother Kosuke, who is twice as old as 04 Jul 2019, 03:24
Kudos
Add Kudos
Bookmarks
Bookmark this Post
This is a very easy question on Word problems, specifically related to ages. This is also a good question for you to understand the basics of framing equations. In case this is an area that you currently face issues with, try solving more problems of this type.

The first step in developing an equation is to develop the variables. Variables are values which represent the unknowns in the question.
The second step is to connect the variables using mathematical operators and develop the LHS and RHS of the equations.
Once you have the LHS and the RHS, you have the equation.

Remember that, most often, the issue that you face with word problems is about framing the equations and not actually solving them. So, once you have the equation in place, solving it won’t be that much of an issue.

In this question, there are 3 unknowns - the ages of Toshi, Kosuke and Junko. Therefore, let’s use 3 variables – T, K and J to represent them.

Toshi is 7 years older than Kosuke. This means, age of Toshi is 7 years MORE than age of Kosuke. So,
T = K + 7. Let this be equation 1.

Kosuke is twice as old as Junko. This means, age of Kosuke is double/two times of age of Junko. So,
K = 2J. Let this be equation 2.
But, age of Junko is 8 years. So, J = 8.

Substituting this value in equation 2, we get K = 2*8 = 16.

Substituting the value of K in equation 1, we get T = 16 + 7 = 23.

Toshi is 23 years old. The correct answer option is D.

Hope this helps!
Moderators:
Bunuel
Math Expert
109818 posts
Krunaal
Tuck School Moderator
853 posts