156k views
1 vote
A jar contains only black and white marbles. When one marble is drawn at random, the probability that it is white is 1/3. After 20 black marbles were added to the jar, the probability of drawing a white was 1/5. How many marbles were in the jar originally?

User Pronskiy
by
8.1k points

1 Answer

4 votes

there are 30 marbles in the jar originally

User Hound
by
8.4k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories