instruction:
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.
question:
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?
answer:
6.5

question:
For his car, Mike spent $118.57 on speakers and $106.33 on newtires. Mike wanted 3 CD's for $4.58 but decided not to. In total,how much did Mike spend on car parts?
answer:
224.9

question:
There are 48 erasers in the drawer and 30 erasers on the desk. Alyssaplaced 39 erasers and 45 rulers on the desk. How many erasers arenow there in total?
answer:
117.0