With kids (2?) on two of seven days, you have 3 people
but not 3 per day. Just you for 5 days is 5 people/days,
and the kids and you for two days is 6 people/days. 11
total people days per week is an 11/7 (1.57) person average.
So your actual ratio, ceied, is 11(dvd players)/1.57(people
per day) or 7. If you've got more than 2 kids, that ratio
gets smaller. Nice try, though! ;-)