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?
6 builders can build a single floor 6 builders / 3 builders = 
<gadget id="calculator">6/3</gadget>
<output>2</output>
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 = 
<gadget id="calculator">5*6</gadget>
<output>30</output>
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 = $
<gadget id="calculator">450*100*6</gadget>
<output>270_000</output>
270000 to complete the project.

<result>270_000</result>