you has some spelling errors, im guessing this is what you ment :
Lee's muffin mix calls for 2/3 cup of milk, 1/3 Cup of oil and 1/3 cup of sugar. How much more milk than oil does she need for the muffin mix
Answer : She needs 1/3 cup more milk than oil
to figure this out do 2/3 - 1/3 = 1/3