It costs a dollars for an adult ticket to a reggae concert

and s dollars for a student ticket. The difference

between the cost of 12 adult tickets and 18 student

tickets is $36. Which of the following equations represents

this relationship between a and s ?

A12a/18s= 36

B216as = 36

C|12a – 18s| = 36

D|12a + 18s| = 36

E|18a + 12s| = 36