Description: Here we have a couple of word problems, one searching for the least common multiple and the other for the greatest common factor. Just read them with us slowly and follow along. You'll get it. Created by Sal Khan. Even though the two classes have to take a different number of exams, their teachers have told them that both classes both classes will get the same total number of exam questions each year. What is the minimum number of exam questions William's or Luis's class can expect to get in a given year? So let's think about what's happening.*Teacher Advisor is 100% free.