I would just try to identify the pattern. First, for the cups column, if the amount increases by 5 each time, then the missing box must be 5 less than 10 or 5
The, for the servings column, you can test to find the pattern. If you were to guess the pattern is 3, when you check, you would see that the boxes are 6 and 9 because then it increases by 3 each time
To start with, you can see that the ratio of servings to cups by looking at the lowest row. 12 servings is 20 cups. So you figure out what one serving is by dividing 20 cups by 12. 1 serve = 1.66 recurring cups, or 1 2/3. So, multiply 1.66 by 3 to get the first space in the table: 3 servings is 5 cups. So that makes the next one easy: 10 cups must be 6 servings. 15 cups would be 9 servings.
You can double check that by looking at the original pair that we started with. And yes, 12 servings is 20 cups fits right in iwth what we just did.
