3 : 6 : 4 = 6 : 12 : 8 Adults in multiple of 4
12/4 = 3
6 - 3 = 3 children free
1 set --> 3 x 2 + 12 x 5 + 8 x 3 = $90 3 children free
90/270 = 3 sets
3 x 6 = 18 children
There were 18 children.
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