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.

There are 7.75 gallons of water in Becky's fish tank. If Becky adds 7.05 gallons more, how many gallons will there be in all?
14.8

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?
0.5

There are 107 walnut trees currently in the park. Park workers willplant 104 walnut trees today. How many walnut trees will the parkhave when the workers are finished?

211.0