Answer:
290 adults and 190 children attended the Play.
Step-by-step explanation:
Given:
Total number of people in play = 480
Let the number of adults be x
and Number of children be y
Hence we can write the equation as;

Also Given:
Price for 1 adult = $2
Price for 1 children = $1
Total admission receipts = $770
Hence we can write the equation as;

Now We will subtract equation 1 from equation 2 we get;

Now substituting the value of x in equation 1 we get;

Hence 290 adults and 190 children attended the Play.