What is the riddle which can be asked all day with a different correct answer each time.

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

You see me once in June, twice in November, and not at all in May. What am I?

What 5-letter word typed in all capital letters can be read the same upside down?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

In case you were starting to feel confident, this one was meant for third graders in Vietnam. The answer is 66, but we don't blame you for scratching your head about how they got there.

What goes up but never comes down?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

There are 2 sand hourglasses.

The small one can measure 5 hours and the large one can measure 7 hours.

How can we measure 16 hours with 2 sand hourglasses running together ?