conversations.from: human
conversations.value: On Mary's birthday, her brother surprised her with $100. She spent a quarter of it on a new video game and then used a fifth of what was left on swimming goggles. How much money did she have left?
  What is the solution?
conversations.from: assistant
conversations.value: Mary spent 100/4= 25 dollars on a new video game.
  So, after the video game purchase, Mary was left with 100 - 25 = 75 dollars.
  Mary then bought swimming goggles for 75/5 = 15 dollars
  Mary had 75 - 15 = 60 dollars left