We decided that the movie night will last four hours each movie takes 1.75 hours and we want to make sure we leave a half hour for eating popcorn so how many movies can we show

2 movies

4 hours -.5 popcorn - 1.75-1.75=0 Easier terms 4 hours minus 30 min is 3 hours and 30 min left each movie is 1 hour and 45 min plus 1 hour 45 min i that's 2 hours and 90 min 90 min are one hour and 30 min. So 2 hours plus one hour and 30 min is the 3 hours and 30 min are we're left