The average age of 20 men is increased by 0.5 years when two of them whose age are 24 and 26 years replaced by two new men. The average age of the two men is:

30 years

Increase in total age of 20 men=20 × 0.5 = 10 years

Total age of 2 men replaced=24 + 26 = 50 years

The total age of the two new men = Increase in total age + age of the 2 men replaced

= 10 + 50 = 60 years

The average age of the two new men= \(\frac{60}{2}\)=30 years