The riddle is more properly written as, "What comes once per year and four times in an average day?"
Answer: The letter "a."
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answer is Six Hours as a year consist of 365 days and 6 hours so it is once in a year secondly in a 24 hrs day 6 hours will come 4 times in a single day.
Oh, dude, that's like some riddle inception right there. So, technically, the answer would be the letter "e." It appears once in the word "year," twice in "month," four times in "week," and six times in "day." Mind blown, right?
once a year
It is meant to describe something occurring 4 times per year, or once per quarter. If you wanted to describe something occurring once every four years, you would say it is a quadrennial event.
Four ... a "quarter" is a fourth. Four into Twelve equals Three. Three times Four is Twelve.