A bag contains 35 balls out of which x are blue (1) If one ball is drawn at random,what - Maths - Probability

Question

A bag contains 35 balls out of which x are blue
(1) If one ball is drawn at random,what is the probability that
it will be a blue ball?
(2) if 7 moreblue balls are put in the bag,the probability of
drawing a blue ball will be double than that in (1)
find x

Anand Sah · Answer

1)X/35
2)IF 7 BLUE BALLS ARE PUT THEN PROBABILITY=(X+7)/42
ACCORDING TO QUESTION
=(X+7)/42=2*X/35
=(X+7)35=2X*42
=35X+245=84X
=X=245/49
=X=5

A bag contains 35 balls out of which x are blue. (1) If one ball is drawn at random,what is the probability that it will be a blue ball? (2) if 7 moreblue balls are put in the bag,the probability of drawing a blue ball will be double than that in (1) find x

A bag contains 35 balls out of which x are blue.

(1) If one ball is drawn at random,what is the probability that it will be a blue ball?

(2) if 7 moreblue balls are put in the bag,the probability of drawing a blue ball will be double than that in (1)

find x