If full then the stadium could have held 60000 people over 3 days. It really held 17563+18126+16618 over the 3 days = 52307 people. To work out the difference 60000 - 52307 = 7693 Therefore 7693 seats were free over the 3 day period and so 7693 more people could have attended the concerts overall
If the stadium had been at full capacity for the concerts over the 3-day period, it could have held 60,000 people. The actual attendance was 52,307 people, leading to a difference of 7,693 people who could have attended. Therefore, 7,693 more seats were available if the stadium had been full.
;