00:01
In this example, we're told that an 8 ounce serving of a particular soda contains 23 milligrams of caffeine, and we want to know if we drink 12 ounces of this soda how much caffeine we would be ingesting.
00:13
We'll be solving this equation by setting up a proportion, and the first equation that proportion will come from this sentence.
00:21
We'll form the numerator using 8 ounces, and we know that 8 ounces contains 23 milligrams of 1 .3 milligrams of 1 .5 .5.
00:30
Caffeine.
00:31
So i'll write 3 ounces to 23 milligrams.
00:36
We're using units here so that when we go to the second sentence and write a proportional equation we'll have the right quantity in the right position.
00:45
So we want to know how much caffeine is in 12 ounces of soda because ounces are in the numerator we must put 12 ounces in the numerator for this fraction as well.
00:55
And the question is how much caffeine is in that 12 ounces.
00:59
Let's let that be x.
01:02
Well, this is going to be measured in milligrams, which tells us that x must belong to the denominator.
01:09
So this is our proportional equation to solve...