conversations.from: human
conversations.value: Sarah buys 20 pencils on Monday. Then she buys 18 more pencils on Tuesday. On Wednesday she buys triple the number of pencils she did on Tuesday. How many pencils does she have?
  What is the solution?
conversations.from: assistant
conversations.value: By adding together Monday and Tuesday, Saah has 20+18= 38 pencils
  On Wednesday, she buys 3 * 18= 54 pencils
  All together, Sarah has 38+54= 92 pencils