41.
If 12 carpenters, working 6 hours a day, can make 460 chairs in 24 days, how many chairs will 18 carpenters make in 36 days, each working 8 hours a day ?

42.
If 5 spiders can catch five files in five minutes, how many files can hundred spiders catch in 100 minutes ?

43.
2 persons working 2 hours a day assemble 2 machine in 2 days. The number of machines assemble by 6 persons working 6 hours a day in 6 day is ?

44.
A wall of 100 meters can be built by 7 men or 10 women in 10 days. How many days will 14 men and 20 women take to build a wall of 600 metres ?

45.
21 binders can bind 1400 books in 15 days. How many binders will required to bind 800 books in 20 days ?