conversations.from: human
conversations.value: This math problem has got me stumped: One-fourth of the airing time of a television program is spent on commercials. If there are 6 thirty-minute programs, how many minutes are spent on commercials for the whole duration of the 6 programs?
  Can you show me the way?
conversations.from: assistant
conversations.value: The total time of the programs is 6 programs * 30 minutes/program = 180 minutes
  A quarter of this time is spent on commercials, so that's 180 minutes / 4 = 45 minutes