The number of audience in a museum is 510 on Sunday and

Solution

  Number of visitors on Sunday: 510   Number of visitors on other days: 240   Total number of days in the month: 30 Since the first day of the month is Sunday, there will be 5 Sundays in the month (including the first day). The remaining days (30 - 5 = 25) will have the number of visitors as 240. Now, we can calculate the total number of visitors for the month: Total visitors = (Number of Sundays × Visitors on Sunday) + (Number of other days × Visitors on other days)   = (5 × 510) + (25 × 240)     = 2550 + 6000   = 8550  Average number of visitors = Total visitors / Total days = 8550 / 30 = 285  So, the average number of audience in the museum for that month is 285.