Q: Eduardo is a teacher. He taught 3 classes last week while his colleague Frankie taught double what Eduardo teaches. How many classes did Eduardo and Frankie teach in total?
A: 9
Explain how we arrive at this answer: 
user
Explanation: Frankie taught 3 * 2 = 6 classes. Combined, Frankie and Eduardo taught 3 + 6 = 9 classes.
assistant