TASK DEFINITION: You are given a math word problem and you are supposed to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.
PROBLEM: John needs $ 2.5 . He has $ 0.75 . How much more money does he need ?

SOLUTION: 1.75

PROBLEM: A pet supply store has 600 bags of dog food and 327 bags of cat food . How many more bags of dog food are there than cat food ?

SOLUTION: 273

PROBLEM: Dan has 64 violet marbles , he gave Mary 14 of the marbles . How many violet marbles does he now have ?

SOLUTION:
50