Difficulty Level: Hard
Stats: 986 / 3,121 ( 31.59% ) got this right

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together?

  • 10
  • 12
  • 15
  • 16
  • 20
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