conversations.from: human
conversations.value: I'm completely lost with this math problem: John is laying the foundation for 3 homes. Each home needs a slab of concrete that is 100 feet by 100 feet by .5 feet. Concrete has a density of 150 pounds per cubic foot. A pound of concrete cost $.02 per pound. How much does the foundation cost?
  Can you give me a hand?
conversations.from: assistant
conversations.value: The volume of the slab is 100*100*.5=5000 cubic feet
  So it weighs 5000*150=750000 pounds
  That means the cost is 750000*$0.02=$15,000 per house
  So the total cost for all 3 houses is $15000*3=$45,000