instruction:
You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.
question:
Arthur baked 35 muffins . How many more muffins does Arthur have to bake to have 83 muffins ?
answer:
48


question:
Mike has 87 baseball cards . Sam bought 13 of Mike 's baseball cards . How many baseball cards does Mike have now ?
answer:
74


question:
There are 107 walnut trees currently in the park . Park workers will plant 104 more walnut trees today . How many walnut trees will the park have when the workers are finished ?
answer:

211