1 4/15 + 2 3/20

\(1\frac{4}{15}=\frac{19}{15}=\frac{76}{60}\), \(2\frac{3}{20}=\frac{43}{20}=\frac{129}{60}\).

\(\frac{76}{60}+\frac{129}{60}=\frac{205}{60}=\frac{41}{12}=3\frac{5}{12}\).

Ответ: \(3\frac{5}{12}\)