Question
A box has ‘x’ black marbles, ‘x + 5’ blue
marbles and ‘x – 1’ yellow marbles. If the probability of selecting a yellow marble is 1/28 less than the probability of selecting a blue marble, find ‘x’.Solution
According to question: (x + 5)/(3x + 4) – (x – 1)/(3x + 4) = 1/28 (x + 5 – x + 1)/(3x + 4) = 1/28 6/(3x + 4) = 1/28 3x + 4 = 168 3x = 164 x = 54
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