Answer:Greater than 70
Explanation:
Given
Cost of three buses is $ 700
maximum no of students in group is 105
Six flag ticket cost $ 50 but will reduce the tickets cost by $ 0.50
Total cost should be less than 25 for each student
let x be the no of students thus
cost for ticket is

Bus cost

Total cost

total cost must be less than $ 25


thus x should be greater than 70 in order to cost to be less than $ 25