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Only red and blue marbles in a box. Probability of choosing a red marble at random is one fourth. If there ar 132 blue marbles, how many marbles are in the box?
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Only red and blue marbles in a box. Probability of choosing a red marble at random is one fourth. If there ar 132 blue marbles, how many marbles are in the box?

User Han Lazarus
by
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1 Answer

1 vote


x - the total number of marbles


|\Omega|=x\\|A|=x-132\\\\P(A)=(1)/(4)=(x-132)/(x)\\\\(1)/(4)=(x-132)/(x)\\x=4(x-132)\\x=4x-528\\3x=528\\x=176

There are 176 marbles in the box.

User Robert Jones
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7.8k points
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