Irene R. answered 08/28/20
BS in Mechanical Engineering and Certified math teacher for 13 years
Hi Alexa,
Since the recipe is for 3 1/2 dozen cookies, we can divide by 3 1/2 or 7/2 to find the amount of vanilla needed for 1 dozen.
2 ÷ 7 = 2 • 2 = 4 tablespoon of vanilla would be needed to make 1 dozen
3 2 3 7 21