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?
Calculus: <<4=4>>4 years
Algebra: 4(2)=8 years
Statistics: 8(5)=<<8*5=40>>40 years
Total number of years taught: 4+8+40=<<4+8+40=52>>52 years
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