TASK DEFINITION: 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.
PROBLEM: Charlie has 31 more snowballs than Lucy . She has 19 snowballs . How many does Charlie have ?

SOLUTION: 50

PROBLEM: Bryan took a look at his books as well . If Bryan has 56 books in each of his 9 bookshelves , how many books does he have in total ?

SOLUTION: 504

PROBLEM: Adam has $ 5 to buy an airplane that costs $ 4.28 . How much change will he get ?

SOLUTION:
0.72