Mary and Percy are both short story writers. Last year, they wrote a total of 21

Question

short stories, and Percy wrote 3

fewer stories than Mary did. Which of the following systems of equations could be used to determine m

, the number of short stories Mary wrote last year, and p

, the number of short stories Percy wrote last year?
Choose 1 answer:
Choose 1 answer:
(Choice A)



A


(Choice B)



B


(Choice C)



C


(Choice D)



D

Answer 1

(Choice A)
m + p = 21
m - p = 3