A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball is double that of a red ball, determine the number of blue balls in the bag.
Answer and explanation
Correct answer: D.
- Step 1: Let number of blue balls be . Total balls .
- Step 2: and .
- Step 3: .
Answer
.
Why not the others: is the number of red balls; triples the count; and quadruples it.
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