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.

[EX Q]: John weighs 81 pounds . Roy weighs 4 pounds . How much heavier is John than Roy ?
[EX A]: 77

[EX Q]: Paul bought 6 boxes of chocolate candy and 4 boxes of caramel candy . If each box has 9 pieces inside it , how much candy did he have total ?
[EX A]: 90

[EX Q]: 30 dogs are barking . 10 more dogs start to bark . How many dogs are barking ?
[EX A]:
40