conversations.from: human
conversations.value: I need help with this problem:
  Manolo bought five lollipops and four candies that cost $3.20. If each lollipop costs $0.40, how much will 10 lollipops and 10 candies cost him?
conversations.from: assistant
conversations.value: Five lollipops cost $0.4 x 5 = $2.
  So four candies cost $3.20 - $2 = $1.20.
  Thus, each candy costs $1.20/4 = $0.30.
  Ten lollipops cost $0.4 x 10 = $4.
  Ten candies cost $0.30 x 10 = $3.
  Hence, 10 lollipops and 10 candies will cost $4 + $3 = $7.