SOLUTION: A box is filled with 5 brown cards, 4 blue cards and 11 yellow cards. A card is chosen at Radom from the box. What is the probability that it is a brown or yellow card

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Question 1135623: A box is filled with 5 brown cards, 4 blue cards and 11 yellow cards. A card is chosen at Radom from the box. What is the probability that it is a brown or yellow card
Answer by ikleyn(52794) About Me  (Show Source):
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P = P(brown) + P(yellow) = 5%2F%285%2B4%2B11%29 + 11%2F%285%2B4%2B11%29 = 5%2F20 + 11%2F20 = 16%2F20 = 4%2F5 = 0.8 = 80%.    ANSWER