More uses for Ratios
Often ratios are used to compare a part of a mixture to another part of a mixture. For example, classic pound cake is made with
- 1 pound butter
- 1 pound eggs
- 1 pound sugar
- 1 pound flour
The ratio of any two ingredients in this cake (say, sugar:butter) is 1:1. On the other hand, a “lowfat” pound cake has
- 12 oz corn-oil butter
- 10 oz eggs
- 13 oz flour
- 21 oz sugar
Now what is the ratio of sugar to butter?
What is the ratio of carb ingredients (sugar and flour) to fat ingredients (eggs and butter)?
Notice that I added some things up before doing the division. This is natural if I’m interested in categories of ingredients in the mixture.
In case you’re missing the connections to biology here…
- blood is a mixture of components
- chemical reactions require (and produce) mixtures of molecules
- animals diets, and individual foods, consist of a mixture of nutrients
We’ll get to some of these lovely examples later in the module.
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