Definition: 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.
Input: 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