Arecipe calls for 1/4 teaspoon of shortening for every 2/3 cup of milk. what is the unit rate of cups per teaspoon? explain

This is the rate per 1/4 of a teaspoon. 
To find the rate for a whole teaspoon, multiply 2/3 by 4 to get 8/3, or 2 2/3.
So, the rate is 2 2/3 cups of shortening per teaspoon. 
Hope this helps!