Answer: x= number of students in smaller class
y= number of students in larger class
the next letter would be C
Step-by-step explanation: x + y = 50
y = x + 6
y=x+6
x+(x+6)=50
x=22 students
y=28 students
The reason for this can be understood by separating the series into three patterns: the vowels (A, E, I, O, U), the letters backward (Z, Y, X, …), and consonants (B, C, D, …).