Let one machine completes 1 unit of work per day. Given, two machines can finish the job in 13 days Therefore, the work of 2×1×13=26 units. Also, let on man completes m units of work per day. From the given condition: 3m+8×1=2(8m+3×1) Or m=
2
13
units Let it require ' x ' number of men to complete the work in 13 days. Therefore, xm×13=26 units Or x=13 men