11.

Five roommates Randy, Sally, Terry, Uma, and Vernon each do one housekeeping task mopping, sweeping, laundry, vacuuming, or dusting one day a week, Monday through Friday.

* Vernon does not vacuum and does not do his task on Tuesday.

* Sally does the dusting, and does not do it on Monday or Friday.

* The mopping is done on Thursday.

* Terry does his task, which is not vacuuming, on Wednesday.

* The laundry is done on Friday, and not by Uma.

* Randy does his task on Monday.

What task does Terry do on Wednesday?

 A. vacuuming B. dusting C. mopping D. sweeping

Explanation:

Terry does not dust, mop, do laundry, or vacuum. Therefore, Terry does the sweeping on Wednesday.

12.

What day does Uma do her task?

 A. Monday B. Tuesday C. Wednesday D. Thursday

Explanation:

Uma does the mopping, which is done on Thursday.

13.

 A. vacuuming B. dusting C. mopping D. sweeping

Explanation:

Vernon does not vacuum, dust, or sweep. Randy does the vacuuming, Sally does the dusting, Terry does the sweepingâ€”leaving laundry and mopping for Uma and Vernon. Uma does not do laundry; therefore, she must mop, and Vernon does the laundry.

14.

What day is the vacuuming done?

 A. Friday B. Monday C. Tuesday D. Wednesday

Explanation:

Dusting is on Tuesday, sweeping is on Wednesday, mopping is on Thursday, and laundry is on Friday. Therefore, the vacuuming is done on Monday.

15.

When does Sally do the dusting?

 A. Friday B. Monday C. Tuesday D. Wednesday