Final answer:
To find how much flour is needed to make 3 dozen cookies, set up a proportion using the given information and solve for the unknown variable 'x'. The amount of flour needed is 2.1 cups.
Step-by-step explanation:
To find how much flour is needed to make 3 dozen cookies, we can set up a proportion using the given information. First, we know that 3.5 cups of flour make 5 dozen cookies. So, if we let 'x' represent the amount of flour needed for 3 dozen cookies, we can set up the proportion:
3.5 cups / 5 dozen = x cups / 3 dozen.
Next, we can cross-multiply and solve for 'x':
3.5 * 3 dozen = 5 * x cups.
10.5 = 5 * x.
Divide both sides by 5:
x = 10.5 / 5.
Therefore, the amount of flour needed to make 3 dozen cookies is 2.1 cups.