conversations.from: human
conversations.value: Solve the math problem: Jenny is working on a school project. She spends 10 hours doing research for the project and 2 hours writing a proposal. If she has 20 hours total to work on the project, how many hours does she have left to write her report?
conversations.from: assistant
conversations.value: So far, Jenny has spent 10+2=12 hours on the project.
  Thus, she has 20-12=8 hours to write her report.