conversations.from: human
conversations.value: Can you guide me through solving this problem: Blake goes to the grocery store and spends $40 on oranges, $50 on apples, and $60 on mangoes. If he has $300, how much change was he given?
conversations.from: assistant
conversations.value: The total costs for the fruits is $40 + $50 + $60 = $150
  The amount of money given as change is $300 - $150 = $150