Answer:
15
Step-by-step explanation:
Total # of balls = red+blue. Three times = 3× redballs(5), hence 3 × 5 = 15
Answer:
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.