Question

A bag contains white,black,red balls only. A ball is drawn at random from the bag. If the probability of getting a white ball is 3÷10 and that of a black ball is 2÷5 then find the probability of getting a red ball.if the bag contains20 black balls then find the total number of balls in the bag

Answer 1

Answer:

15

Step-by-step explanation:

P(of red ball)= 1-(3/10+2/5)

= 1-(3+4/10)

= 1-7/10

= 10-7/10

P(of red ball)=3/10

No of black balls=> 20/total no.of balls=2/5

=>50=Total no.of balls

No.of red balls=>

3/10=No.of red balls/50

15=No.of red balls

No.of white balls=>

3/10=No.of white balls/50

15=No.of white balls

Hope it helped..