A survey was given asking whether they watch movies at home from Netflix, Redbox, or a video store. Use the results to determine how many people use Redbox.
42 only use Netflix
44 only use Redbox
12 only use a video store
11 use only a video store and Redbox
42 use only Netflix and Redbox
33 use only a video store and Netflix
10 use all three
27 use none of these
How any people just use RedBox?