Answer:
28 grams
Explanation:
Make a porportion
For every 0.5 cups of milk, there are 4 grams of protein
For every 3.5 cups of milk, there are x grams of protein
0.5/4=3.5/x
Cross multiply
0.5x=14
Divide by 0.5 on both sides
x=28
So, for 2.5 cups of milk, there is 28 grams of protein
Hope this helps!