l. Next to Simon's high school is a river that is 30 meters wide. Students can cross the river by walking over a bridge. One-fifth of the length of the bridge goes over land on one side of the river, and one-fifth of the length of the bridge goes over land on the other side of the river. What is the total length of the bridge? Answer: _ 2. There is a new film,  the price of which is 20 dollars for each adult and 10 for each child; if you buy three tickets or more you will have a 10% discount; Susan, a primary school student, together with her parents is going to see the film. How much will they pay? Answer: _