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:
Tom found 7 seashells but 4 were broken. How many unbrokenseashells did Tom find?
answer:
3.0

question:
There are 9 oak trees currently in the park. Park workers had to cutdown 2 oak trees that were damaged. How many oak trees will thepark have when the workers are finished?
answer:
7.0

question:
Joan found 79 seashells on the beach, she gave Mike 63 of theseashells. How many seashells does she now have?
answer:
16.0