Question 840862
let popcorns be x and small drinks be y
then, 3x+2y = 21  ---1
2x + 4y = 22 ---2

Solving equation 1 and 2 we have

6x + 4y = 42
6x +12y = 66
============
8y = 24
y = 3

therefore the small drink cost $3.00