Answer
Explanation:
Britanny wants to make cookies
The recipe for making one cookie is 2 1/4 cups flour
The total number of cups she has is 9 cups of flour
Step 1: convert the mixed fractions into an improper fraction
2 1/4 = (4 x 2) + 1 / 4
2 1/4 = 8 + 1/ 4
2 1/4 = 9/4 cups
1 batch of cookie = 9/4 cups
b batches of cookies = 9 cups
Cross multiply
1 x 9 = b x 9/4
9/4 b = 9
Cross multiply
9b = 9 x 4
9b = 36
Divide both sides by 9
9b/9 = 36/9
b = 4
Therefore, the answer is 2 1/4b = 9 and b = 4
