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: 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: Oscar's bus ride to school is 0.75 mile and Charlie's bus ride is 0.25mile. How much longer is Oscar's bus ride than Charlie's?
Example Output: 0.5

Example Input: Jessica grew 35 watermelons and 30 carrots, but the rabbits ate 27watermelons. How many watermelons does Jessica have?
Example Output:
8.0