Final answer:
To find the number of scoops of flour needed for 78 cookies, set up a proportion and solve for x.
Step-by-step explanation:
To find the number of scoops of flour needed for 78 cookies, you can use the concept of proportions.
First, set up a proportion using the given information:
65 cookies / 5 scoops of flour = 78 cookies / x scoops of flour
Cross-multiply to solve for x:
65x = 78 * 5
Divide both sides by 65 to find the value of x:
x = (78 * 5) / 65
Calculate the value of x to get the number of scoops of flour needed for 78 cookies.