instruction:
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.
question:
A pet store had 36 siamese cats and 18 house cats . During a sale they sold 26 cats . How many cats do they have left ?
answer:
28


question:
30 dogs are barking . 10 more dogs start to bark . How many dogs are barking ?
answer:
40


question:
A teacher had 6 worksheets to grade . If she graded 4 , but then another 18 were turned in , how many worksheets would she have to grade ?
answer:

20