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 were 9 red orchids and 3 white orchids in the vase. Sally cutsome red orchids from her flower garden. There are now 15 redorchids in the vase. How many red orchids did she cut?
Student:
6.0