Devin teaches one math course per year. He taught Calculus for 4 years, Algebra for twice as many years, and Statistics for 5 times as long as he taught Algebra. How many years has Devin taught? Let's answer step by step:
Calculus: 4 years. Algebra: 4(2) = 8 years. Statistics: 8(5) = 40 years. Total number of years taught: 4 + 8 + 40 = 52 years. The answer: 52.