Concept: Let the number of kids' tickets be
x, then adult tickets are
5x, and form an equation from the total sales.
Explanation:Let
x = number of kids' tickets sold.
Then adult tickets sold =
5x.
Revenue from kids' tickets =
250x.
Revenue from adult tickets =
520(5x)=2600x.
Total sales =
250x+2600x=171,000.
So,
2850x=171,000.
x=2850171,000=60.
Thus, 60 kids' tickets were sold, and 300 adult tickets were sold.
Answer: 60 kids' tickets were sold. Hence, the correct option is D.