Answer:
78 persons
Explanation:
Given



Required
Determine the maximum number of person that can be invited
Let the number of persons be p.
If the hall charges $37 for 1 person, then it will charge $37p for p persons.
So:

The expression becomes:

Substitute values for Clean up, Charges and Budget

Subtract 100 from both sides



Make p the subject


Round down

Hence, they can only invite 78 people to stay within budget