Puzzles and logic › Clocks and calendars › Calendars
Library visits of two friends
Middle school · ●●●○○ 50 pts
Xiao Ming goes to the library on the first Wednesday of January, and then again every 4 days, meaning there are 4 days between visits (so the second visit is on a Monday). Xiao Qiang goes to the library on the first Thursday of January, and then again every 3 days, meaning there are 3 days between visits. If in January the two went to the library together only once, on which day of January was this?