100 people were asked if they knew who any of the following are: Thor, Zeus, and Osiris. 25 people did not know any of these. 3 people knew all three. 48 people knew who Zeus or Osiris were but did not know who Thor was. 40 people knew who Osiris was. 21 people knew who at least two of these were. 7 people knew who Thor and Osiris were but did not know who Zeus was. 8 people knew who Thor and Zeus were. How many people were there who knew only Thor?
