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.

[EX Q]: Fred has 5 baseball cards . Melanie bought 3 of Fred 's baseball cards . How many baseball cards does Fred have now ?
[EX A]: 2

[EX Q]: There were 58 geese and 37 ducks in the marsh . How many birds were in the marsh ?
[EX A]: 95

[EX Q]: Nancy has 7 black balloons . Mary has 4 times more black balloons than Nancy . How many black balloons does Mary have now ?
[EX A]:
28