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.

Luke was putting his spare change into piles . He had 5 piles of quarters and 5 piles of dimes . If each pile had 3 coins in it , how many coins did he have total ?
30

Tiffany baked 8 brownies , but needed 17 total for her party . If she used 8 cups of flour on each one , how much cups of flour does she still need ?
72

A painter needed to paint 6 rooms in a building . Each room takes 5 hours to paint . If he already painted 2 rooms , how much longer will he take to paint the rest ?

20