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				| 1. | Six bells commence tolling together and toll at intervals of 3, 6, 9, 12, 15 and 18 seconds respectively. In 60 minutes, how many times do they toll together ? | 
| A. | 10 | 
| B. | 20 | 
| C. | 21 | 
| D. | 15 | 
| Answer» D. 15 | |