conversations.from: human
conversations.value: Find a solution for this math problem: Alyssa and Chelsea jointly bought 40 candles to decorate their room. Alyssa used half of them, and Chelsea used 70% of the remaining candles. How many candles are there in the room now?
conversations.from: assistant
conversations.value: Alyssa used half of the candles, which is 1/2*40 = 20 candles
  The number of candles that remained is 40-20 = 20
  Chelsea used 70% of the remaining candles, a total of 70/100*20 = 14 candles.
  The total number of candles in the room now is 40 - 20-14 = 6