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 had 7 quarters and 9 nickels in his bank. His dad gave him 3nickels and 5 pennies. How many nickels does Tim have now?
Example Output: 12.0

Example Input: Milford Lake was originally blue because it only had 809 algae plants.Now there are 3263 algae plants, and the lake has turned green.How many more algae plants are in Milford Lake now?
Example Output: 2454.0

Example Input: There were 6 roses in the vase. Mary cut some roses from her flower garden. There are now 16 roses in the vase. How many roses did she cut?
Example Output:
10.0