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desireeflores42
There are 30 adults. Because if there are only three-tenths of adult visitors, you're finding 30% of 100 adult visitors. There are 30 Adults. 
emmarvc
To find the answer you times 3/10 by 100 to find how many visitors were adults, you are finding 30% of the visitors. In this case 3/10 x 100 = 30, so 30 of the visitors are adults. :)