conversations.from: human
conversations.value: Solve the following math problem: Reyna had 20 lamps with seven light bulbs in each lamp. If 1/4 of them have 2 burnt-out light bulbs each, how many light bulbs are working?
conversations.from: assistant
conversations.value: The total number of light bulbs in the 20 lamps is 20*7 = 140
  If 1/4 of the 20 lamps have burnt-out light bulbs, there are 1/4*20 = 5 lamps with burn out light bulbs
  Since each of the 5 lamps has 2 burnt-out light bulbs, the number of burn out light bulbs is 2*5 = 10
  The number of working light bulbs is 140 -10 = 130