Ms. pacheco, mr. edwards, and mr. richards are three math teachers at turner middle school. ms. pacheco is three years older than mr. richards. mr. edwards is twice as old as mr. richards. the sum of mr. richards' age and mr. edwards' age is 81. how old is each person?

The number of hours per week that the television is turned on is determined for each family in a sample. the mean of the data is 37 hours and the median is 33.2 hours. twenty-four of the families in the sample turned on the television for 22 hours or less for the week. the 13th percentile of the data is 22 hours. approximately how many families are in the sample? round your answer to the nearest integer.