If you would like to find the unit rate for vanilla to sugar, you can do this using the following steps:
2 teaspoons of vanilla ... 3/4 cup of sugar
x teaspoons of vanilla = ? ... 1 cup of sugar
2 * 1 = 3/4 * x
2 = 3/4 * x
x = 2 * 4/3
x = 8/3
x = 2 2/3 teaspoons of vanilla
The correct result would be 2 2/3 teaspoons of vanilla per 1 cup of sugar.