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: Kelly's chemistry textbook weighs 7.125 pounds and her geometrytextbook weighs 0.625 pound. How much more does the chemistrytextbook weigh than the geometry textbook?

6.5