What has many keys but can’t open a single lock?

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.

Why is it against the law for a man living in Delhi to be buried in Mumbai?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

What is the next number in the series?

15 29 56 108 208 ?

Can you name an animal whose killing cannot be performed without spilling your own blood?

Where do fish keep their money?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?