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.

Input: Consider Input: Keith has 20 books. Jason has 21 books. How many books do theyhave together?

Output: 41.0

Input: Consider Input: Last week Tom had 74 dollars. He washed cars over the weekend andnow has 86 dollars. How much money did he make washing cars?

Output: 12.0

Input: Consider Input: A restaurant made 9 hamburgers and 4 hot dogs to serve during lunch. Only 3 hamburgers were actually served. How many hamburgerswere over?
Output: 6.0