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: 30 dogs are barking . 10 more dogs start to bark . How many dogs are barking ?

SOLUTION: 40

PROBLEM: Melanie picked 4 plums , Dan picked 9 plums , and Sally picked 3 plums from the plum tree . How many plums were picked in total ?

SOLUTION: 16

PROBLEM: Keith spent $ 136.01 on speakers , $ 139.38 on a CD player , and $ 112.46 on new tires . He wanted 3 CD 's for $ 6.16 , but did n't buy them . In total , how much did he spend ?

SOLUTION:
387.85