total of 426 tickets were sold for the school play. They were either adult tickets or student tickets. The number of student tickets sold was two times the number of adult tickets sold. How many adult tickets were sold?
a = adult, s = student
a + s = 426
s = 2a Put this in the equation above:
a + 2a = 426
3a = 426
a = 142
There were 142 adult tickets sold.
+35 
