Three builders build a single floor of a house in 30 days. If each builder is paid $100 for a single day's work, how much would it cost to hire 6 builders to build 5 houses with 6 floors each? Let's answer step by step:
6 builders can build a single floor 6 builders / 3 builders = 2 times as fast as 3 builders. Thus 6 builders would build a single floor in 30 days / 2 = 15 days. There are 5 hours x 6 floors / house = 30 floors in total in 5 houses with 6 floors each. Therefore 6 builders would complete the project in 15 days / floor x 30 floors = 450 days. It would cost 450 days x $100 / day / builder * 6 builders = $270000 to complete the project. The answer: 270000.