Final answer:
Jenny would need 3.5 cups of sugar to make 7 dozen cookies.
Step-by-step explanation:
To find out how much sugar is needed to make 7 dozen cookies, we can set up a proportion. Jenny's recipe calls for 2 cups of sugar for 4 dozen cookies. Let x represent the amount of sugar needed for 7 dozen cookies. The proportion can be set up as follows:
2 cups / 4 dozen = x cups / 7 dozen
Cross-multiplying the proportion, we get:
2 * 7 dozen = 4 dozen * x cups
Simplifying the equation, we have:
14 = 4x
Dividing both sides by 4, we find that x = 14 / 4 = 3.5 cups
Therefore, Jenny would need 3.5 cups of sugar to make 7 dozen cookies.