A unique clock chimes once at 1 o'clock, twice at 2 o'clock, three times at 3 o'clock, and so on up to 12 o'clock. How many total chimes does this clock make in a full 24-hour day?
156
In 12 hours, the clock chimes 1+2+...+12 = 78 times. In a 24-hour day, it does this twice, so 78 * 2 = 156.
About this riddle
Math riddles hide a calculation inside a short story. Pull out the numbers, work out what is being asked, and watch for a trick such as a unit change.
Difficulty: Medium. More like this: Math riddles with answers or try Target 24 for a different kind of puzzle.
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