Last visit was: 23 Apr 2026, 11:45 It is currently 23 Apr 2026, 11:45
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
User avatar
xmagedo
Joined: 09 Jun 2010
Last visit: 13 Jan 2011
Posts: 41
Own Kudos:
188
 [4]
Given Kudos: 17
Posts: 41
Kudos: 188
 [4]
1
Kudos
Add Kudos
3
Bookmarks
Bookmark this Post
avatar
ulm
Joined: 03 Jun 2010
Last visit: 20 Aug 2019
Posts: 95
Own Kudos:
Given Kudos: 40
Location: United States (MI)
Concentration: Marketing, General Management
WE:Business Development (Consumer Packaged Goods)
Products:
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
ghettosquad
Joined: 05 Jul 2010
Last visit: 23 Mar 2014
Posts: 8
Own Kudos:
Given Kudos: 7
Posts: 8
Kudos: 23
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
EMPOWERgmatRichC
User avatar
Major Poster
Joined: 19 Dec 2014
Last visit: 31 Dec 2023
Posts: 21,777
Own Kudos:
Given Kudos: 450
Status:GMAT Assassin/Co-Founder
Affiliations: EMPOWERgmat
Location: United States (CA)
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Expert
Expert reply
GMAT 1: 800 Q51 V49
GRE 1: Q170 V170
Posts: 21,777
Kudos: 13,047
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Hi All,

This question is an example of a fairly straight-forward probability question.

Probability = (# of ways that give us what we "want")/(Total # of ways possible).

Here, we have a total of 25+100+175 = 300 blocks and 25 of those blocks are red. Thus, the probability of randomly pulling one red block from that group is...

25/300 = 1/12

Final Answer:

GMAT assassins aren't born, they're made,
Rich
User avatar
ScottTargetTestPrep
User avatar
Target Test Prep Representative
Joined: 14 Oct 2015
Last visit: 23 Apr 2026
Posts: 22,283
Own Kudos:
26,531
 [1]
Given Kudos: 302
Status:Founder & CEO
Affiliations: Target Test Prep
Location: United States (CA)
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 22,283
Kudos: 26,531
 [1]
1
Kudos
Add Kudos
Bookmarks
Bookmark this Post
xmagedo
A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. What is the probability that a block picked at random from the box will be red ?

A. 1/25
B. 1/12
C. 1/7
D. 1/5
E. 1/3

The box contains 25 + 100 + 175 = 300 blocks. Since there are 25 red blocks, the probability of picking one red block out of the box is 25/300 = 1/12.

Answer: B
User avatar
BrentGMATPrepNow
User avatar
Major Poster
Joined: 12 Sep 2015
Last visit: 31 Oct 2025
Posts: 6,733
Own Kudos:
Given Kudos: 799
Location: Canada
Expert
Expert reply
Posts: 6,733
Kudos: 36,451
Kudos
Add Kudos
Bookmarks
Bookmark this Post
xmagedo
A box contains 25 red blocks, 100 blue blocks, and 175 yellow blocks. What is the probability that a block picked at random from the box will be red ?

A. 1/25
B. 1/12
C. 1/7
D. 1/5
E. 1/3

There are 25 red blocks
There are 300 blocks in total (25 + 100 +175 = 300)

P(block is red) = (number of ways to select a red block)/(total number of outcomes)
= 25/300
= 1/12

Answer: B

Cheers,
Brent
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 38,964
Own Kudos:
Posts: 38,964
Kudos: 1,117
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Automated notice from GMAT Club BumpBot:

A member just gave Kudos to this thread, showing it’s still useful. I’ve bumped it to the top so more people can benefit. Feel free to add your own questions or solutions.

This post was generated automatically.
Moderators:
Math Expert
109783 posts
Tuck School Moderator
853 posts