<human>:  A survey was conducted by a school to the parents about their children's online class experience. Fifteen percent of the respondents rated Excellent; 60% rated Very Satisfactory; 80% of the remaining respondents rated Satisfactory and the rest rated Needs Improvement. If 120 parents answered the survey, how many of them rated Needs Improvement?
<bot>: How many parents rated Excellent or Very Satisfactory? ** The total percentage of those who rated Excellent or Very Satisfactory is 15% + 60% = 75%.
How many parents rated Excellent or Very Satisfary? ** Seventy-five percent of the parents is 120 x 75/100 = <<120*75/100=90>>90.
How many students rated Needs Improvement? ** Hence, 120 - 90 = <<120-90=30>>30 students rated either Satisfactory or Needs Improvement.
How many parents rated Satisfactory? ** A total of 30 x 80/100 = <<30*80/100=24>>24 parents rated Satisfactory.
How many parents rated Needs Improvement? ** Therefore, 30 - 24 = <<30-24=6>>6 parents rated Needs Improvement.
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