Final answer:
The question is asking how many pies Serena ate. By subtracting the number of pies left (511) from the original number of pies made (600), we find that Serena ate 89 pies.
Step-by-step explanation:
The subject of this question is Mathematics. Here, we are trying to solve a simple subtraction problem to find out how many pies Serena ate. The question states that Peter made 600 pies, but when he returned home, he found only 511 pies. We can find the number of pies Serena ate by subtracting the number of pies Peter found when he returned home from how many he originally made. So, the calculation will be 600 (original number of pies) - 511 (number of pies left) which equals 89. Therefore, Serena ate 89 pies. Comparing this to the options given in the question, our answer matches with option A - 89.
Learn more about Subtraction