If the baker used
and it was
too much, then we must perform the following math calculation:

This will find the actual amount that the baker needed to use. To do this calculation we can use the Keep Change Switch rule.
Keep
, change the division to multiplication, and then switch the numerator with the denominator on the second fraction to get
This gives us:

Now multiply the numerators and put that over the product of the denominators.

Make sure you reduce your fractions, always good to do that!
The baker should have used
cups of flour.