Write the following ratios in three ways.

(a) The ratio of blue marbles to gray marbles: to

(b) The ratio of total marbles to black marbles: :

(c) The ratio of gray marbles to total marbles: /

There are (2 + 3 + 4 = 9) marbles in all.

Thus, the ratios can be written as:

(a) 2 to 4, 2:4,

(b) 9 to 3, 9:3,

(c) 4 to 9, 4:9,