You are provided with an arithmetic question. Your task is to compute the solution using the given arithmetic operations. The only arithmetic operators needed to answer the questions are'+'(addition) and'-'(subtraction). The answer should be correct to one decimal place.

Ex Input:
Fred has 10 red balloons, Sam has 46 red balloons, and Dan has 16red balloons. The balloons cost 10 dollars. How many red balloonsdo they have in all?

Ex Output:
72.0

Ex Input:
Jason had Pokemon cards. He gave 9 to his friends. He now has 4Pokemon cards. How many Pokemon cards did he have to start with?

Ex Output:
13.0

Ex Input:
Keith found 6 seashells, Jessica found 8 seashells, and Tim found 7seashells on the beach. When they cleaned them, they discoveredthat 3 were cracked. How many seashells did they find together?

Ex Output:
21.0