Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What can you see in the middle of March and April that you can never see in any other month?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

Can it be possible to build a house that has all its four walls facing towards the South?

What has 88 keys?

I can be cracked, made, told, and played. What am I?

Why is it very easy to weigh a fish?

I am not alive, but I grow; I don't have lungs, but I need air; I don't have a mouth, but water kills me. What am I?

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?