conversations.from: human
conversations.value: This math problem has got me stumped: To heat during the winter, Ali ordered 850 kilos of coal. The coal is delivered in 50 kg bags, costing $18 per unit. How much does his order cost?
  Can you show me the way?
conversations.from: assistant
conversations.value: The number of bags Ali ordered is 850 kg/ 50 kg/bag = 17 bags
  The total order cost is 17 bags x $18/bag = $306