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: Sara has 3 green and 5 red marbles. Tom has 4 green marbles. Howmany green marbles do they have in total?

Answer: 7.0


Question: Craig walked 0.2 mile from school to David's house and 0.7 mile fromDavid's house to his own house. How many miles did Craig walk in all?

Answer: 0.9


Question: There are 33 walnut trees currently in the park. Park workers willplant 44 walnut trees today. How many walnut trees will the parkhave when the workers are finished?

Answer:
77.0