There are 18 balls in a jar. You take out 3 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 choices:  A) 12  B) 9  C) 8  D) 7  E) 6
There are 18 balls in a jar. You take out 3 blue balls without putting   3 blue balls + 15 / 5 =6   Answer:6
<result>E</result>
There are 18 balls in a jar. You take out 3 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?