You are given a math word problem and you are supposed to apply multiple mathematical operators like addition, subtraction, multiplication or division on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

A store had 5 oranges in a bin . If they threw away 2 of the old ones and put 28 new ones in the bin how many would be in the bin ?
31

Luke had 48 dollars in January . By March he had spent 11 dollars . If he got another 21 dollars from his mom , how much money would he have ?
58

Mrs. Hilt saw a rollercoaster . 7 students rode the rollercoaster every 5 minutes . How many students rode the rollercoaster in 15 minutes ?

21