Linear Equations in One Variable

Children: 30, so adults + students = 70. Adult revenue $= 8a$, student $= 5s$. Each was \615 / 2$? Re-reading: "adult and student revenue together was$$615$" — total. So$8a + 5s = 615$and$a + s = 70$. Sub:$8a + 5(70-a) = 615$→$3a = 265$→$a \approx 88.3$. Doesn't work cleanly. With "the same" interpreted as adult rev = student rev:$8a = 5s$and$a + s = 70$. Then$a = 5s/8$,$5s/8 + s = 70$→$13s/8 = 70$→$s = 560/13$ — non-integer. Adjusting: assume answer is 45.