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.

[EX Q]: In fourth grade there were 11 students at the start of the year . During the year 6 students left and 42 new students came to school . How many students were in fourth grade at the end ?
[EX A]: 47

[EX Q]: While shopping , Maria bought 35 green towels and 21 white towels . If she gave her mother 34 of them , how many towels did Maria end up with ?
[EX A]: 22

[EX Q]: A book is on sale for 10 % off . If the regular price is 27.9 dollars , what is the sale price ?
[EX A]:
25.11