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:
In 1 week , Mitch 's family drank 0.5 carton of regular milk and 0.1 carton of soy milk . How much milk did they drink in all ?
answer:
0.6

question:
Shelby ' s teacher gives out gold stars for great math work . Yesterday , Shelby earned 4 gold stars . Today , she earned 3 more . How many gold stars did Shelby earn in all ?
answer:
7

question:
At the fair there were 12 people in line for the bumper cars . If 10 of them got tired of waiting and left and 15 more got in line , how many people would be in line ?
answer:
17