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:
There are 5 oak trees currently in the park. Park workers will plant 4oak trees today. How many oak trees will the park have when theworkers are finished?
answer:
9.0


question:
Fred has 40 baseball cards. Keith bought 22 of Fred's baseball cards.How many baseball cards does Fred have now?
answer:
18.0


question:
Tim found 679 seashells and 110 starfish on the beach. He gave 172of the seashells to Sara. How many seashells does Tim now have?
answer:

507.0