During Spirit Week, the band decided to have a bake sale every day of the 7-day week. Three booth workers were appointed: a sophomore, a junior, and a senior. Here are the clues about who worked when:
- On only one day of the week were all three students to help.
- No student helped three days in a row.
- No two students were off on the same day more than one time.
- The sophomore was off on Sunday, Tuesday, & Thursday.
- The junior was off on Thursday & Saturday.
- The senior was off on Saturday.
On which day of the week were all three students working?
Here is a schedule that works:
| M | T | W | R | F | S | S | |
| soph. | X | X | X | X | |||
| jr. | X | X | X | X | |||
| sr. | X | X | X | X |
All three students worked on Friday.