Answer:
He went over by 5/12 of a cup
Explanation:
Consider the provided information.
The recipe says that he has to mix 32 grams of vanilla powder to the flour.
Jeff knows that 1 cup of that particular vanilla powder has a mass of 128 grams. He added 2/3= of a cup of vanilla powder to the flour.
grams.
That means he added
grams of vanilla but he needs to add only 32 grams of vanilla.
Now find how much he added more.
grams.
That means he added
grams more vanilla powder.
Lets find
is how much of a cup.
If we multiply
with 128 we will get:

Hence, He went over by 5/12 of a cup