Answer: The required number of cups needed is 0.75.
Step-by-step explanation: Given that we need
cups of sugar to make 20 cookies.
We are to find the number of cups of sugar needed to make 12 cookies.
We will be using the UNITARY method to solve the problem.
We have
Number of cups of sugar needed to make 20 cookies is

So, the number of cups of sugar needed to make 1 cookie is

Therefore, the number of cups of sugar needed to make 12 cookies is given by

Thus, the required number of cups needed is 0.75.