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: A dust storm sweeps across the prairie. It covers 64535 acres of theprairie in dust, but leaves 522 acres untouched. How many acresdoes the prairie cover?
Example Output: 64013.0

Example Input: Mary is baking a cake. The recipe calls for 7 cups of flour and 3 cupsof sugar. She already put in 2 cups of flour. How many cups of flourdoes she need to add?
Example Output: 5.0

Example Input: There are 33 pencils and 44 crayons in the drawer. Joan placed 27 pencils in the drawer. How many pencils are now there in total?
Example Output:
60.0