SAT Math Multiple Choice Practice Question 346: Answer and Explanation
16. A jar contains only white and blue marbles of identical size and weight. The ratio of the number of white marbles to the number of blue marbles is 4 to b. If the probability of choosing a white marble from the jar at random is ?, then what is the value of b?
Correct Answer: D
D The ratio of white marbles to blue marbles is 4 to b. The probability of randomly selecting a white marble from the jar is ?. This means that one out of every four marbles in the jar is white and three out of every four marbles are blue. If there are four white marbles, then there are blue marbles.