conversations.from: human
conversations.value: The buyers who came to Mr. Brandon's shop yesterday bought goods worth $80. If 2/5 of the total amount of sales Mr. Brandon made yesterday were credit sales, and the rest were cash sales, how much did Mr. Brandon get from cash sales?
  Give me a solution to this problem
conversations.from: assistant
conversations.value: 2/5 of the total amount of sales Mr. Brandon made yesterday, which were credit purchases, were worth 2/5*$80=$32
  The cash sales that Mr. Brandon made yesterday was $80-$32=$48