This clever word riddle asks:
“What can be seen once in a second, twice in a decade?”
At first, it sounds like the question might be about time. You may start thinking about clocks, years, or something that happens at certain intervals.
But the trick is much simpler.
Look closely at the words themselves.
SECOND contains the letter E once.
DECADE contains the letter E twice.
So the correct answer is:
The letter E.
The riddle works because the words “second” and “decade” make us immediately think about measurements of time. But instead of thinking about what happens during those periods, you need to examine how the words are spelled.
Once you notice that pattern, the answer becomes obvious.
Answer: The letter E.
Did you figure it out before checking the answer?


