Question

Maalox and Donnatal are to be combined in a 2:1 ratio. How much of each is required to make 180 ml of the suspension?

Answer 1

We let x be the common number in which we can multiply the ratio 2:1 to obtain the desired volume, 180. If we add 2x and 1x (or simply x), the answer should be 180.
2x + x = 180
The value of x from the generated equation above is 60. Therefore, the amounts of Maalox and Donnatal are equal to 120 and 60 mL, respectively.