If 50 numbers have an average of 76, then the sum of these 50 numbers is $50(76)=3800$. If 40 numbers have an average of 80, then the sum of these 40 numbers is $40(80)=3200$. Therefore, the sum of the 10 remaining numbers is $3800-3200=600$, and so the average of the 10 remaining numbers is $\frac{600}{10}=60$.