Last visit was: 18 Nov 2025, 21:34 It is currently 18 Nov 2025, 21:34
Home
GMAT
Messages
Tests
Schools
Events
Rewards
Chat
My Profile
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: 18 Nov 2025
Posts: 105,355
Own Kudos:
778,097
 [3]
Given Kudos: 99,964
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: 105,355
Kudos: 778,097
 [3]
Jennifer owns only black hats and blue hats, in a ratio of 5 black hat 04 Jan 2022, 10:00
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
00:00
Start Timer
Pause Timer
Resume Timer
Show Answer
Hide
Show
History
A
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% (00:42) correct 7% (00:44) wrong based on 155 sessions

History

Date
Time
Result
Not Attempted Yet
Jennifer owns only black hats and blue hats, in a ratio of 5 black hats to every 2 blue hats. If she has 28 total hats, how many blue hats does she own?

A. 8

B. 10

C. 12

D. 20

E. 28
ShowHide Answer
Official Answer
A
User avatar
$!vakumar.m
User avatar
Joined: 06 Dec 2021
Last visit: 25 Aug 2025
Posts: 493
Own Kudos:
626
Given Kudos: 737
Location: India
Concentration: Technology, International Business
GPA: 4
WE:Human Resources (Telecommunications)
Posts: 493
Kudos: 626
Jennifer owns only black hats and blue hats, in a ratio of 5 black hat 08 May 2023, 08:58
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Jennifer owns only black hats and blue hats, in a ratio of 5 black hats to every 2 blue hats. If she has 28 total hats, how many blue hats does she own?
5k + 2k = 28
=> 7k = 28
or k = 4
so Jennifer has 2k = 8 blue hats and 5k = 20 black hats
hence, answer is A
User avatar
Abhishek009
User avatar
Board of Directors
Joined: 11 Jun 2011
Last visit: 18 Jul 2025
Posts: 5,937
Own Kudos:
5,327
Given Kudos: 463
Status:QA & VA Forum Moderator
Location: India
GPA: 3.5
WE:Business Development (Commercial Banking)
Posts: 5,937
Kudos: 5,327
Jennifer owns only black hats and blue hats, in a ratio of 5 black hat 09 May 2023, 01:08
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Bunuel
Jennifer owns only black hats and blue hats, in a ratio of 5 black hats to every 2 blue hats. If she has 28 total hats, how many blue hats does she own?

A. 8

B. 10

C. 12

D. 20

E. 28
Show more
\(\frac{2}{(5+2)}*28=8\), Answer must be (A)
User avatar
uCS2020
User avatar
Joined: 02 Aug 2020
Last visit: 15 Nov 2025
Posts: 50
Own Kudos:
29
Given Kudos: 274
Posts: 50
Kudos: 29
Jennifer owns only black hats and blue hats, in a ratio of 5 black hat 09 Oct 2023, 11:03
Kudos
Add Kudos
Bookmarks
Bookmark this Post
The ratio of (black hats:blue hats) is 5:2.
The total number of hats is 28.
The total of one of the the hats would be
5x for black or 2x for blue.
5x + 2x = 28
7x = 28
X = 28/7 = 4
So we can do 2*x(x=to 4) so we get 8 blue hats

Answer:8

Posted from my mobile device
Moderators:
Bunuel
Math Expert
105355 posts
Krunaal
Tuck School Moderator
805 posts