conversations.from: human
conversations.value: Solve the following math problem: Ella has 4 bags with 20 apples in each bag and six bags with 25 apples in each bag. If Ella sells 200 apples, how many apples does Ella has left?
conversations.from: assistant
conversations.value: 4 bags have 4 x 20 = 80 apples.
  And, six bags have 6 x 25 = 150 apples.
  Thus, Ella has 80 + 150 = 230 apples in all.
  Therefore, Ella has 230 - 200 = 30 apple left.