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.
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Question: There are 12 birds on the fence . 8 more birds land on the fence . How many birds are on the fence ?

Answer: 20


Question: Ruby has 63 apples . Emily takes 55 away . How many apples will Ruby have ?

Answer: 8


Question: Ezra drew a white line that was 7.666666666666667 inches long . Then he drew a blue line that was 3.3333333333333335 inches long . How much longer was the white line than the blue line ?

Answer:
4.333333333333333