A bag contains 10 black and 20 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?  Options:
A) 1/2
B) 3/4
C) 2/3
D) 1/5
E) 3/7
Total number of balls = 10+20= 
<gadget id="calculator">10+20</gadget>
<output>30</output>
30   Number of white balls= 20   probability of drawing a white ball = 20/30 = 2/3   Answer is 2/3
<result>C</result>
A bag contains 10 black and 20 white balls. One ball is drawn at random. What is the probability that the ball drawn is white?