Adult tickets for the school musical sold for 3.50 and student tickets sold for 2.50. Three hundred twenty-one tickets were sold all together for 937.50. How many of each kind of ticket were sold?
a = # adult tix value = $ 3.50 a
s = # student tix = 321-a value = $ 2.50 ( 321 -a)
summed = 937.5
3.5 a + 2.5(321-a) = 937.5 solve for 'a' the adult tix sold then student tix = 321-a