100 people went to the amusement park.  51 went on roller-coasters, 29 went to the haunted house and 11 went on water slides.  7 went on roller-coasters and to the water slides, 9 went on the roller-coasters and to the haunted house and 5 went to the haunted house and the water slides. 30 did not go to any. How many went on all three?       30 people did not go on any of the three.

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