conversations.from: human
conversations.value: I need a clearer understanding of how to solve: Lily had $55 in her account. She spent $7 on a shirt. She then went to another shop and spent thrice as much as she spent on a shirt. How much money is left in Lily's account?
conversations.from: assistant
conversations.value: After spending money on a shirt, Lily had $55 - $7 = $48 left.
  She spent $7 x 3 = $21 on another store.
  Therefore, she only has $48 - $21 = $27 left on her account.