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.

There are 48 erasers in the drawer and 30 erasers on the desk . Alyssa placed 39 erasers and 45 rulers on the desk . How many erasers are now there in total ?
117

Luke made 9 dollars mowing lawns and 18 dollars weed eating . If he only spent 3 dollar a week , how long would the money last him ?
9

While shopping , Maria bought 40 green towels and 44 white towels . If she gave her mother 65 of them , how many towels did Maria end up with ?

19