Let's denote the number of adult tickets sold as \( x \) and the number of kids' tickets sold as \( y \).
We can set up the following system of equations based on the information provided:
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The total number of tickets sold: \[ x + y = 600 \]
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The total revenue from ticket sales: \[ 8x + 5y = 4116 \]
Now we can solve this system of equations.
From the first equation, we can express \( y \) in terms of \( x \): \[ y = 600 - x \]
Now we can substitute this expression for \( y \) into the second equation: \[ 8x + 5(600 - x) = 4116 \]
Expanding this gives: \[ 8x + 3000 - 5x = 4116 \]
Combining like terms: \[ 3x + 3000 = 4116 \]
Now, isolate \( x \): \[ 3x = 4116 - 3000 \] \[ 3x = 1116 \] \[ x = \frac{1116}{3} = 372 \]
Now that we have \( x \), we can find \( y \) using the first equation: \[ y = 600 - x = 600 - 372 = 228 \]
Thus, the number of adult tickets sold is \( \boxed{372} \), and the number of kids' tickets sold is \( \boxed{228} \).