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1. 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 ?

Solution:
Let the required number of chairs be x
Then, More carpenters, More chairs (Direct proportion)
More hours per day, More chairs (Direct proportion)
More days, More chairs (Direct proportion)
Carpenters 12:18Hours per day 6:8Days 24:36}::460:x
 12×6×24×x=18×8×36×460x=(18×8×36×460)(12×6×24)x=1380
∴ Required number of chairs = 1380

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