conversations.from: human
conversations.value: Caleb bought 10 cartons of ice cream and 4 cartons of frozen yoghurt. Each carton of ice cream cost $4 and each carton of frozen yoghurt cost $1. How much more did Caleb spend on ice cream than on frozen yoghurt?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: The cost of the ice cream is 10 × $4 = $40.
  The cost of the frozen yoghurt is 4 × $1 = $4.
  Caleb spent $40 − $4 = $36 more on ice cream than on frozen yogurt.