Lewis has a bag of colored marbles. the bag contains 24 red marbles, 36 blue marbles, and 60 yellow marbles. what are the ratios of the number of red marbles, blue marbles, and yellow marbles to the total number of marbles?           a. red = 1: 2; blue = 3: 10; yellow = 1: 5   b. red = 2: 3; blue = 3: 5; yellow = 1: 2   c. red = 1: 5; blue = 3: 10; yellow = 1: 2   d. red = 1: 5; blue = 3: 5; yellow = 1: 2