3/7\, of\,455 + 5/8\, of\,456 = ?

Answer: Option D

$$\begin{array}{rl}& \text{Given Expression,}\\ & \frac{3}{7}\times 455+\frac{5}{8}\times 456\\ & =\left(3\times 65+5\times 57\right)\\ & =195+285\\ & =480\end{array}$$