There are $33$ red balls, $x$ white balls and $y$ black balls in a box. When one ball is drawn

Question

There are $33$ red balls, $x$ white balls and $y$ black balls in a box. When one ball is drawn at random from the box, the probability that the ball is white is $0.2$ and the probability that the ball is black is $0.25$. Find the probability that the ball is red, the values of $x$ and $y$.

Accepted Answer

(a) 11/20; (b) x=12, y=15.

Probability Analysis: Determining Unknown Frequencies via Algebraic Equations

Probability Analysis: Determining Unknown Frequencies via Algebraic Equations

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