Myles's school is selling tickets to an end of the year picnic. During the first week, they sold 20 adult tickets and 30 student tickets for a total of $410. The second week, the took in $445 by selling 15 adult tickets and 50 student tickets. How much does a student ticket cost? *
20a + 30s = 410 , divide by 10 ----> 2a + 3s = 41
15a + 50s = 445 , divide by 5 ------> 3a + 10s = 89
now it is easier to solve for a and s, I suggest good ol'fashioned elimination.