conversations.from: human
conversations.value: Jill bought 5 packs of red bouncy balls and 4 packs of yellow bouncy balls. Each package contained 18 bouncy balls. How many more red bouncy balls than yellow bouncy balls did Jill buy?
  What is the solution?
conversations.from: assistant
conversations.value: Jill bought 5 packs * 18 red balls = 90 red balls.
  Jill bought 4 packs * 18 yellow balls = 72 red balls.
  Jill had 90 red – 72 yellow = 18 more red balls.