The numbers 1 through 20 are written on twenty golf balls, with one number on each ball. The golf balls are placed in a box, and one ball is drawn at random. If each ball is equally likely to be drawn, what is the probability that the number on the golf ball drawn is a multiple of 3 ?
(A) $\frac{3}{20}$
(B) $\frac{6}{20}$
(C) $\frac{10}{20}$
(D) $\frac{5}{20}$
(E) $\frac{1}{20}$
There are 20 possible golf balls that can be drawn, and 6 of them have multiples of 3 written on them (ie. 3, 6, 9, 12, 15, 18). Therefore, the probability that the number on the golf ball drawn is a multiple of 3 is $\frac{6}{20}$.

ANSWER: (B)