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 chef needs to cook 13 potatoes . He has already cooked 5 . If each potato takes 6 minutes to cook , how long will it take him to cook the rest ?
48

Mrs. Hilt bought a notebook for $ 1.3 . She paid with nickels . How many nickels did she use to buy the notebook ?
26

A worksheet had 7 problems on it . If a teacher had 17 worksheets to grade and had already graded 8 of them , how many more problems does she have to grade ?
63