1990 AJHSME Problems/Problem 14

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Problem

A bag contains only blue balls and green balls. There are $6$ blue balls. If the probability of drawing a blue ball at random from this bag is $\frac{1}{4}$ , then the number of green balls in the bag is

$\text{(A)}\ 12 \qquad \text{(B)}\ 18 \qquad \text{(C)}\ 24 \qquad \text{(D)}\ 30 \qquad \text{(E)}\ 36$

Solution

The total number of balls in the bag must be $4\times 6=24$ , so there are $24-6=18$ green balls $\rightarrow \boxed{\text{B}}$

1990 AJHSME (Problems • Resources)
Preceded by Problem 13	Followed by Problem 15
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1990 AJHSME Problems/Problem 14

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