Yes it was very easy when i learned it so i can very much help you!!
The answer to this would be 0.381. Rounded to the nearest thousandth.
Initially, milk needed = 3 3/4 = 15/4
If it doubles, 15/4 * 2 = 30/4 = 15/2 in fraction form
OR 7.5 in decimal form
OR 7 1/2 in mixed form
I know that one is obtuse and acute