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: In one week, Mitch's family drank 0.5 carton of regular milk and 0.1 carton of soy milk. How much milk did they drink in all?

0.6