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

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To solve this problem you need to know how many parts there are in the ratio. 2 parts Maalox and 1 part Donnatal. Together, thats 3 parts total.
Now you divide 180ml by 3, this will give 60 ml for each part.
Since Maalox has 2 parts in the ratio you multiply 60 by 2 which gives 120.

Now you know that you need 120 ml Maalox and 60 ml Donnatall. Together that will be 180 ml.

I hope this help!