instruction:
Given a math word problem, answer the following question. You might need to apply addition or subtraction mathematical operators on the numbers embedded in the text to answer the question and then only report the final numerical answer.
question:
ted and fred measured their height . fred 's height is 98 inches . ted is 39 inches tall . what 's the difference between ted 's height and fred 's height ?
answer:
59

question:
simon mark kevin and carl love collecting stamps . they meet up every month to compare and share their collections with each other . during the previous month kevin was able to collect 45 stamps while simon was only able to collect 27 how many more stamps does kevin have more than simon ?
answer:
18

question:
marcus and his friends are starting a recycling project to help the school raise some money for charity . they were tasked to collect different materials and create useful things from those . if marcus was able to gather 25 milk bottles and john was able to gather 20 milk bottles how many milk bottles do they have available for recycling ?
answer:
45