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# If a bag contains 18 yellow tiles and 22 black tiles, what is the prob

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Math Expert
Joined: 02 Sep 2009
Posts: 55638
If a bag contains 18 yellow tiles and 22 black tiles, what is the prob  [#permalink]

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17 Sep 2018, 01:47
00:00

Difficulty:

5% (low)

Question Stats:

88% (00:28) correct 13% (00:22) wrong based on 43 sessions

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If a bag contains 18 yellow tiles and 22 black tiles, what is the probability that a tile selected at random from the bag will be yellow?

A. $$\frac{1}{10}$$

B. $$\frac{9}{20}$$

C. $$\frac{11}{20}$$

D. $$\frac{9}{11}$$

E. $$\frac{11}{9}$$

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Joined: 01 Aug 2017
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GMAT 1: 500 Q47 V15
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Re: If a bag contains 18 yellow tiles and 22 black tiles, what is the prob  [#permalink]

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17 Sep 2018, 02:11
Bunuel wrote:
If a bag contains 18 yellow tiles and 22 black tiles, what is the probability that a tile selected at random from the bag will be yellow?

A. $$\frac{1}{10}$$

B. $$\frac{9}{20}$$

C. $$\frac{11}{20}$$

D. $$\frac{9}{11}$$

E. $$\frac{11}{9}$$
.

Total number of tiles in a bag is $$18 + 22 = 40$$.

Probability = $$\frac{Favorable Outcome}{Total number of Outcome}$$

Probability = $$\frac{18}{40}$$

Probability = $$\frac{9}{20}$$

Ans - B
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Re: If a bag contains 18 yellow tiles and 22 black tiles, what is the prob   [#permalink] 17 Sep 2018, 02:11
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