conversations.from: human
conversations.value: Can you guide me through solving this problem: A fruit and vegetable merchant installed 15 kg of carrots, 13 kg of zucchini and 8 kg of broccoli. He sold only half of them. What mass of vegetables did he sell?
conversations.from: assistant
conversations.value: You first need to know the total weight of the vegetables, so you add each quantity: 15 + 13 + 8 = 36 kg
  Then you have to find half of 36: 36/2 = 18 kg.
  So, he sold 18 kg of vegetables.