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28 October, 20:44

A box is filled with 11 blue cards, 2 green cards, and 7 brown cards. A card is chosen at random from the box. What is the probability that it is a blue or a brown card? Write your answer as a fraction in simplest form

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  1. 28 October, 22:33
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    11 blue

    2 green

    7 brown

    total is 20 card

    7 out of that 20 are brown

    so x out of 100% are brown

    7/20=x/100 - cross multiply

    700=20x

    x=700/20

    x=70/2
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