4) 1 7/16 + 2 5/25

\(1\frac{7}{16}+2\frac{5}{25}=1\frac{7}{16}+2\frac{1}{5}=3+\frac{35}{80}+\frac{16}{80}=3\frac{51}{80}\).

Ответ: \(3\frac{51}{80}\).