posted by Jessica .
By 7:00P.M., 1/3 or the junior class has arrived at a school dance. By 8:09PM., 30 more juniors had arrived, raised attendance to 1/2 of the juniors class. How many people are in the juniors class?
I don’t understand.. can someone help?
(1/3 c) + 30 = 1/2 c