You are given a math word problem and you are supposed to apply multiplication or division mathematical operators on the numbers embedded in the text to answer the following question and then only report the final numerical answer.

At the town carnival Oliver rode the ferris wheel 7 times and the bumper cars 3 times . If each ride cost 3 tickets , how many tickets did he use ?
30

Mary ’ s car gets 20 miles per gallon of gas . How far can she drive on 14 gallons of gas ?
280

A chef needs to cook 9 potatoes . He has already cooked 7 . If each potato takes 3 minutes to cook , how long will it take him to cook the rest ?

6