conversations.from: human
conversations.value: Solve the math problem: It takes 5 people to lift a car and twice as many people to lift a truck. How many people are needed to lift 6 cars and 3 trucks?
conversations.from: assistant
conversations.value: It takes 5 x 2 = 10 people to lift a truck.
  5 x 6 = 30 people are needed to lift the cars.
  10 x 3 = 30 people are needed to lift the trucks.
  Altogether, 30 + 30 = 60 people are needed.