A bag contains 5 red balls and some blue balls. The probability of drawing a blue ball from the bag is thrice that if red ball. Find the number of blue balls in the bag
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let the number of blue balls be 'X'
number of red balls = 5
total number of balls = X + 5
P ( blue ball) = X/(X + 5)
P (red ball) = 5/(X + 5)
According to question,
3 × 5/(X + 5) = X /(X + 5 )
15 × (X + 5) / (X + 5) = X
15 = X
Ans. Number of blue balls in the bag = 15
number of red balls = 5
total number of balls = X + 5
P ( blue ball) = X/(X + 5)
P (red ball) = 5/(X + 5)
According to question,
3 × 5/(X + 5) = X /(X + 5 )
15 × (X + 5) / (X + 5) = X
15 = X
Ans. Number of blue balls in the bag = 15
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