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
correct option is B
Which approach did you use to solve this and how best can option C be recommended as the answer
5-Day Free Trial
5-day free, full-access trial TTP
Available with Beat the GMAT members only code
MORE DETAILS
Probability
This topic has expert replies
-
BTGmoderatorRO
- Moderator
- Posts: 772
- Joined: Wed Aug 30, 2017 6:29 pm
- Followed by:6 members
GMAT/MBA Expert
-
[email protected]
- Elite Legendary Member
- Posts: 10392
- Joined: Sun Jun 23, 2013 6:38 pm
- Location: Palo Alto, CA
- Thanked: 2867 times
- Followed by:511 members
- GMAT Score:800
Hi Roland2rule,
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: B
GMAT assassins aren't born, they're made,
Rich
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: B
GMAT assassins aren't born, they're made,
Rich
GMAT/MBA Expert
-
Scott@TargetTestPrep
- GMAT Instructor
- Posts: 7244
- Joined: Sat Apr 25, 2015 10:56 am
- Location: Los Angeles, CA
- Thanked: 43 times
- Followed by:29 members
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.BTGmoderatorRO wrote: ↑Sun Sep 10, 2017 2:22 pmA 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
correct option is B
Which approach did you use to solve this and how best can option C be recommended as the answer
Answer: B
Scott Woodbury-Stewart
Founder and CEO
[email protected]
See why Target Test Prep is rated 5 out of 5 stars on BEAT the GMAT. Read our reviews
