A bag contains 5 red balls and some blue balls. If the probability of drawing a blue ball at random from the bag is three times that of a red ball, find the number of blue balls in the bag?

15

Step-by-step explanation:

Total # of balls = red+blue. Three times = 3× redballs(5), hence 3 × 5 = 15

10

Step-by-step explanation:

Let number of blue balls =x

Total number of balls =5+x

Probability for a red ball = x+5/5

Probability for a blue ball =5+x/x

According to the question 5+x/x=2( x+5/5)⇒x=10 ∴

 Number of blue balls=10.

cut 138 centimeters off

step-by-step explanation:

250-112 = 138

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