D
this is because there are 27 total students and 3 groups. let x represent the number of students per group. the equation would be 3(x)=27
if u need to solve for x, it would be x =9
a rough estimate is 26 because 20+2(3)=26
3 pounds of apples are 6.36
19.75+ 2.12(3) = 26.11