Final answer:
By setting up an algebraic equation with blueberries being four times the number of red berries, and the total being 40 berries, we solve for the number of blueberries Stacy ate, which is 32.
Step-by-step explanation:
The question involves solving a simple algebraic equation to find out how many blueberries Stacy ate if she had four times as many blueberries as red berries and used a total of 40 berries. Let us denote the number of red berries as R and the number of blueberries as B. The problem states that B = 4R and B + R = 40. To find the values of B and R, we can set up the following system of equations:
Substitute the first equation into the second equation:
- 4R + R = 40
- 5R = 40
- R = 8
Now, using the value of R, we can find out how many blueberries Stacy ate:
- B = 4 × R
- B = 4 × 8
- B = 32
The correct answer is A) 32 blueberries.