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: Sam's dog had puppies and 8 had spots. He gave 2 to his friends. Henow has 6 puppies. How many puppies did he have to start with?
Example Output: 8.0

Example Input: The Silvergrove Public Library used a grant to purchase 2647 books.Now the library has a total of 8582 books. How many books did thelibrary have before the grant?
Example Output: 5935.0

Example Input: Brennan had 0.25 grams of pepper. Then he used 0.15 grams of thepepper to make some scrambled eggs. How much pepper doesBrennan have?
Example Output:
0.1