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.

While shopping , Emily bought 5 green towels and 30 white towels . If she gave her mother 26 of them , how many towels did Emily end up with ?
9

Sara grew 4 onions , Sally grew 5 onions , and Fred grew 9 onions . How many onions did they grow in all ?
18

A new building needed 12 windows . The builder had already installed 6 of them . If it takes 4 hours to install each window , how long will it take him to install the rest ?
24