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.

Tim found 679 seashells and 110 starfish on the beach. He gave 172of the seashells to Sara. How many seashells does Tim now have?
507.0

Some insects called aphids attack a large farm. In response, thefarmer releases ladybugs onto the fields. There are 12170 ladybugswith spots and 54912 ladybugs without spots. How many ladybugsare there in all?
67082.0

There are 53 maple trees currently in the park. Park workers willplant maple trees today. When the workers are finished there will be64 maple trees in the park. How many maple trees did the workersplant today?

11.0