conversations.from: human
conversations.value: Jon makes 3/4's the salary that Karen makes. John makes $3000 per month. How long will it take him to make the same amount of money that Karen does in 3 months?
conversations.from: assistant
conversations.value: Karen makes $3000 / (3/4) = $4000 per month.
  In three months, Karen would make a total of $4000 * 3 = $12000.
  To make the same amount of money John would need to work $12000 / $3000 = 4 months.