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

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