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A church clock strikes as many times as the hour at each full hour, and nothing in between. From the time shown until 9:15 the same evening, how many strikes are heard?

Competition practiceClocks
  • A42
  • B30
  • C45
  • D39

Step-by-Step Solution

The clock shows 3:30, so the next strikes are at 4, 5, 6, 7, 8 and 9: 4 + 5 + 6 + 7 + 8 + 9 = 39. (42 wrongly includes 3 o'clock; 30 stops at 8.)
Answer: D) 39

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