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]: Tom has 30 violet balloons , he gave Fred 16 of the balloons . How many violet balloons does he now have ?
[EX A]: 14

[EX Q]: Craig walked 0.2 mile from school to David 's house and 0.7 mile from David 's house to his own house . How many miles did Craig walk in all ?
[EX A]: 0.9

[EX Q]: Connie had some marbles . She gave 73 to Juan . Now she has 70 marbles left . How many did she have to start with ?
[EX A]:
143