Answer: He can only make 45 cookies.
Step-by-step explanation: If he only has 3 cups, we need to find the unit rate to find how many cookies he can make.
If you divide 60 by 4 you get 15. This means 1 cup of flour can get you 15 cookies.
To see how many cookies 3 cups of flour gets you, we need to multiply 15 by 3.
Your final answer is 45.