Teacher: You are given a math word problem and you are supposed to apply a single mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report final the numerical answer.
Teacher: Now, understand the problem? If you are still confused, see the following example:
Rachel strolled to Nicholas 's house . It is 10 miles from Rachel 's house to Nicholas 's house . It took Rachel 5 hours to get there . How fast did Rachel go ?
Solution: 2
Reason: Rachel's speed = distance/time = 10/5 = 2

Now, solve this instance: Carson ’ s teacher gives out gold stars for great math work . Yesterday , Carson earned 6 gold stars . Today , he earned 9 more . How many gold stars did Carson earn in all ?
Student:
15