Answer:
1st Play 45 people; 2nd Play 37 people; 3rd Play 53 people
Step-by-step explanation:
Admission prices were: $9 per child & $17 per adult.
It is only matter of playing with the numbers until you get the number you want. In this case, the number all plays have in common is $541 which represents the amount she collected for attendance.
1st Play 28 children ($252) + 17 adults ($289) = $541 and 45 people
2nd Play 11 children ($99) + 26 adults ($442) = $541 and 37 people
3rd Play 45 children ($405) + 8 adults ($136) = $541 and 53 people
This way, each night the number of people in attendance was different but the amount collected in each play was $541.