**Solution****-**

5 dozen = 5×12= 60

[Since l dozen $=12$ ]

Accoring to question,

Number of oranges that can be bouglis in Rs $300=60$

$\therefore$ Number of oranges that can be bought in I rupee $-\frac{60}{300}$

$\therefore$ Number of oranges that can bo bought in Rs $125=\frac{60}{300} \times 125=\frac{1}{5} \times 125=25$