Question

A bag contains 5 red balls and some blue balls.if the probability of drawing up a blue ball is four times that of the red ball.then find the number of blue balls in the bag.

Answer 1

Answer:

Total balls =5+x

P(red)=

5+x

5

P(blue)=

5+x

x

P(blue)=3×P(red)

⇒

5+x

x

=

5+x

3×5

⇒x=15

Answer 2

Answer:

answer is ...total number of blue balls in bag is 20

Step-by-step explanation:

let be the number of blue balls

number of red ball is 5

then, total number of balls in bag= 5+x

p(red ball) = 5/5+x

p(blue balls)= x/5+x

now,

x/5+x= 4* 5/5+x

then we got,,

x= 20

this answer is correct