Mathematics > Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

A jar contains only red marbles and green marbles. If a marble is selected at random from the jar, the probability that a red marble will be selected is 2 over 3. If there are 36 green marbles in the jar, how many red marbles are there in the jar?

(A) 18

(B) 24

(C) 54

(D) 72

(E) 108

正確答案>>>