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: Sam had 49 pennies and 24 nickels in his bank. His dad gave him 39 nickels and 31 quarters. How many nickels does he have now?

63.0