Question

a bag contain 5 red balls and some blue balls . If the probabibility of drawing blue balls is four time that of red ball, find the number of blue balls

Answer 1

Answer: 20 blue balls

Step-by-step explanation:

Total no.of balls be x

Total no.of red balls = 5

Total no. of blue balls = x–5

Then probability of red balls = 5/x

Probility of blue balls = x–5/x

BTP,

Probility of blue ball is 4times that of red then,

X-5/x = 4(5/x)

=X–5/x = 20/x

=Both denominator x will cut off

Then,

= X–5 = 20

= X = 20+5

= X= 25

Hence,total no.of ball = x = 25

Total no.blue balls be = x-5 = 20