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.
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Question: Last Saturday, Spencer walked all over town running errands. First, he walked 0.3 mile from his house to the library and 0.1 mile from thelibrary to the post office. Then he walked 0.4 mile from the postoffice back home. How many miles did Spencer walk in all?

Answer: 0.8


Question: There are 4 walnut trees currently in the park. Park workers will plant 6 walnut trees today. How many walnut trees will the park havewhen the workers are finished?

Answer: 10.0


Question: Mary had 33 Pokemon cards, and 6 were torn. Sam gave Mary 23new Pokemon cards. How many Pokemon cards does Mary have now?

Answer:
56.0