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: Vince's bus ride to school is 0.725 mile and Zachary's bus ride is 0.525 mile. How much longer is Vince's bus ride than Zachary's?
Example Output: 0.2

Example Input: Jessica is baking a cake. The recipe calls for 8 cups of flour and 2 cupsof sugar. She already put in 4 cups of flour. How many cups of flourdoes she need to add?
Example Output: 4.0

Example Input: Tom found 5 seashells on the beach. he gave Jessica 2 of theseashells. How many seashells does he now have?
Example Output:
3.0