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.

Example Input: Tim has 22 books. Mike has 20 books. How many books do they havetogether?
Example Output: 42.0

Example Input: There are 48 pencils and 40 scissors in the drawer. Joan placed 29pencils in the drawer. How many pencils are now there in all?
Example Output: 77.0

Example Input: A construction company bought 5.91 tons of gravel and 8.19 tons ofsand. How many tons of material did the company buy in all?
Example Output:
14.1