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There are only apples and oranges in a box. What is the probability

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There are only apples and oranges in a box. What is the probability [#permalink]

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New post 28 Mar 2018, 07:22
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Question Stats:

77% (00:31) correct 23% (00:02) wrong based on 26 sessions

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There are only apples and oranges in a box. What is the probability that the fruit selected at random from the box is an apple?

1) There are 2 apples in the box.
2) The ratio of the number of apples to the number of oranges is 1 to 4.
[Reveal] Spoiler: OA

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Re: There are only apples and oranges in a box. What is the probability [#permalink]

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New post 28 Mar 2018, 09:28
itisSheldon wrote:
There are only apples and oranges in a box. What is the probability that the fruit selected at random from the box is an apple?

1) There are 2 apples in the box.
2) The ratio of the number of apples to the number of oranges is 1 to 4.



Only Apple (a) and Orrange (o) in the box.
1. Information only for a, nothing for o ------------>NS
2. a:o=1:4 ------------->Suff
say a=1 & o=4 , =>n=5 hence P(a) = \(\frac{a}{n}\)= \(\frac{1}{5}\)
or say a=2 & o=8 , hence P(a) = \(\frac{a}{n}\)= \(\frac{2}{10}\)= \(\frac{1}{5}\)

Thus Ans B
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Re: There are only apples and oranges in a box. What is the probability [#permalink]

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New post 30 Mar 2018, 00:09
1 insuff as no info for O
2 A:O 1:4 given , therefore A:total = 1:5, this will be true for ny number of values satisfying A:O 1:4 , hence P(A) = A/total fruits
=1/5, hence suff
Re: There are only apples and oranges in a box. What is the probability   [#permalink] 30 Mar 2018, 00:09
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