Question 16
The picture shows a March calendar. Four siblings Andy, Billy, Cindy and Dolly share housework. Housework is done every day in March except Saturdays and Sundays. Andy does housework on odd-numbered dates only. Billy does housework on all Thursdays and Mondays. Cindy does housework every day in the second week. Dolly wants to do housework alone. On how many days in March does Dolly do housework?

Editorial question note: follow the source’s intended complete schedule. The listed rules assign all the stated days to Andy, Billy and Cindy, subject to the weekend exception for everyone. Dolly takes the remaining weekdays alone.

Editorial question note: follow the source’s intended complete schedule. The listed rules assign all the stated days to Andy, Billy and Cindy, subject to the weekend exception for everyone. Dolly takes the remaining weekdays alone.