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If a bag contains 18 yellow tiles and 22 black tiles, what i

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If a bag contains 18 yellow tiles and 22 black tiles, what i [#permalink] New post 16 Sep 2018, 11:34
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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. \(\frac{11}{9}\)
[Reveal] Spoiler: OA

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Re: If a bag contains 18 yellow tiles and 22 black tiles, what i [#permalink] New post 19 Sep 2018, 10:07
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Carcass 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. \(\frac{11}{9}\)


Number of YELLOW tiles in bag = 18
TOTAL number of tiles in bag = 18 + 22 = 40

P(selected tile is yellow) = (# of possible outcomes in which the selected tile is yellow)/(TOTAL # of possible outcomes)
= 18/40
= 9/20

Answer: B

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Brent
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Re: If a bag contains 18 yellow tiles and 22 black tiles, what i   [#permalink] 19 Sep 2018, 10:07
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