OK, let me try this: subtract 3 from 7. Start with 7, take away 3 from that 7, and you get 4. Huh. Positive.
Full explainer: 3 WLD hosts (Bert, Vicki, Robb). 7 guys on Just Men. So far, 7-3=4. 8 obstacles on Double Dare. 8x4=32.
For 3: 7 Joker mystery categories, 6 Pyramid categories. 7+6=13, minus 3 bachelor(ette)s=10.
We're not counting the person choosing the date, are we? Since technically, he or she is a bachelor(ette) as well.