Let us suppose that 8 men require x days to tar the road.
Number of days required by 10 men to tar the road = 4
The number of men and the number of days required to tar the road are in inverse proportion.
∴ 8 × x = 10 x 4
∴ x = (10 x 4)/8
∴ x = 5
∴ 8 men will require 5 days to tar the road.
