conversations.from: human
conversations.value: Jackson had 20 kilograms of meat. He used 1/4 of the meat to make meatballs and used 3 kilograms of meat to make spring rolls. How many kilograms of meat are left?
  How to solve this?
conversations.from: assistant
conversations.value: Jackson used 20 x 1/4 = 5 kilograms of meat to make meatballs.
  He had 20 - 5 = 15 kilograms of meat left.
  So 15 - 3 = 12 kilograms of meat are left.