There are 25 balls in a jar. You take out 5 blue balls without putting them back inside, and now the probability of pulling out a blue ball is 1/5. How many blue balls were there in the beginning?
Choose the correct choice from the following
A) 12.	B) 9.	C) 8.	D) 7.	E) 6.
9 = 5 blue balls + 20/ 5   Answer: 9.
<result>B</result>
There are 25 balls in a jar. You take out 5 blue balls without putting them back inside, and now the probability of pulling out a blue ball is 1/5. How many blue balls were there in the beginning?