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

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Manager
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A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks.  [#permalink]

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New post 19 Jul 2010, 03:07
00:00
A
B
C
D
E

Difficulty:

  5% (low)

Question Stats:

95% (00:17) correct 5% (00:49) wrong based on 109 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
Spoiler: OA
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Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks.  [#permalink]

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New post 19 Jul 2010, 03:40
There are 25 reds out of 300 blocks.

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

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New post 19 Jul 2010, 04:33
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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New post 07 Dec 2017, 14:50
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

Final Answer:
Spoiler: ::
B


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Re: A box contains 25 red blacks, 100 blue blocks, and 175 yellow blocks. &nbs [#permalink] 07 Dec 2017, 14:50
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