15% of the students in the marching band wear glasses if 12 studentshow many students are in the marching band

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.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation