alleryA clock rings 1 to 12 strokes twice a day. How many strokes does it ring in all?
A144
B156
C78
D168
Answer & Solution
Correct answer: B. 156
1. One round of 1 to 12 strokes totals 12 x 13 / 2 = 78.
2. Two rounds a day total 78 x 2 = 156.
3. 78 is only one round, and 144 is 12 x 12.
_Source: Wikipedia, 24-hour clock, History_
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