Q: There are 20 hands in Peter’s class, not including his. Assume every student in the class has 2 arms and 2 hands. How many students are in Peter’s class including him?
A: There are 20 + 2 of Peter’s hands = 22 hands in Peter’s class including his. There are 22 hands / 2 hands per student = 11 students. The answer is 11.

Q: Oprah has 3500 cars in her collection. If the average number of cars she gives away per year is 50, how many years will it take to reduce her car collection to 500?
A: If Oprah wants to have 500 cars left, she will have to give away 3500 - 500 = 3000 cars. Since the average number of cars she gives away per year is 50, it will take her 3000 / 50 = 60 years to give away enough cars to have 500 left over. The answer is 60.

Q: A church has 100 members who've volunteered to bake cookies for the homeless in their local town. If each member baked 10 sheets of cookies, and each sheet has 16 cookies, calculate the total number of cookies the church members baked?
A:
A sheet has 16 cookies, so if each church member baked 10 sheets, they each baked 10 sheets / person * 16 cookies / sheet = 160 cookies / person. The total number of church members who decided to volunteer is 100, so in total, they baked 160 cookies / person * 100 people = 16000 cookies. The answer is 16000.