If 12 carpenters, working 6 hours a day,can make 460 chairs in 24 days, how many chairs will 18 carpenters make in 36days, each working 8 hours a day?
A
1260
B
1320
C
920
D
1380
Correct Answer: 1380
Total work time for 12 carpenters is = 12×6×24 hours = 72×24 hours Total work time for 18 chapter is = 18×8×36 hours = 144×36 hours In 72×24 hours they can make 460 chairs In 144×36 hours they can make ( 460×144×36)/(72×24) = 1380 chairs