15 35/39 : 5 = \(\frac{39 \cdot 15 + 35}{39} \div 5 = \frac{585 + 35}{39} \div 5 = \frac{620}{39} \div 5 = \frac{620}{39 \cdot 5} = \frac{124}{39}\)
Ответ: 124/39