In the middle school band, the ratio of students who play brass to students who were lay percussion is 5 to 2. Which of the following could be the number of students in the band and the number of students who play brass?
A. 42 band members, 21 brass
B. 35 band members, 25 brass
C. 25 band members, 10 brass
D. 21 band members, 6 brass
Please explain how to give the answer also