Final answer:
Hector found 63 shells over 7 days, which means he collected 9 shells each day including Tuesday.
Step-by-step explanation:
Hector spent a week at the beach, from Sunday to the following Saturday, and found a total of 63 shells. Since he found an equal number of shells each day, we can calculate the number of shells he found daily.
- Determine the total number of days Hector spent at the beach: Sunday to Saturday is 7 days.
- Divide the total number of shells by the number of days: 63 shells ÷ 7 days = 9 shells per day.
- Therefore, the number of shells Hector found on Tuesday or any other single day was 9 shells.