Teacher: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.
Teacher: Now, understand the problem? Solve this instance: 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?
Student:
117.0