Question 710074
five carpenters can finish 30 tables in 2 days, 
one carpenter can finish 30 tables in 2*5=10 days, 
one carpenter can finish 1 table in 10/30=1/3 days, 
8 carpenters can finish 1 table in 1/8*3=1/24 days,
8 carpenters can finish 100 tables in 100/24=25/6=4 1/6 days,