Question 1148041
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Be sure to read the question carefully.  The way you set up the problem, the number of kids at the festival was 810.  But the problem says 810 is the total number of kids and adults.<br>
There are many ways to set up the problem for solving.  I would use a different approach than the other tutor.  It's not a "better" way; it's just a way that works best for me.  And it is another option for you; use whichever method you like.<br>
The ratio of kids to adults is 11:7, so 11/18 of the people are kids and 7/18 are adults.  Then the number of adults is<br>
{{{810*(7/18) = (810*7)/18 = (90*7)/2 = 630/2 = 315}}}