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# A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks.

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Manager
Joined: 09 Jun 2010
Posts: 70
A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. [#permalink]

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19 Jul 2010, 02:07
00:00

Difficulty:

5% (low)

Question Stats:

96% (00:18) correct 4% (00:50) wrong based on 89 sessions

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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 ?

1/25
1/12
1/7
1/5
1/3
[Reveal] Spoiler: OA
Manager
Joined: 03 Jun 2010
Posts: 167
Location: United States (MI)
Concentration: Marketing, General Management
Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. [#permalink]

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19 Jul 2010, 02:40
There are 25 reds out of 300 blocks.

25/300 = 1/12 (B)
Intern
Joined: 05 Jul 2010
Posts: 26
Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. [#permalink]

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19 Jul 2010, 03:33
You're right. It would be B.
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Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. [#permalink]

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07 Dec 2017, 13:50
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

[Reveal] Spoiler:
B

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Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks.   [#permalink] 07 Dec 2017, 13:50
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