Which alphabet is a part of our body?

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.

Solve the below puzzle by replacing the question mark with the correct number.

3 6 12

4 8 16

5 10 ?

When is the top of a mountain similar to a savings account?

In a jungle where there are no street lights or any other artificial source of lights, I notice a black snake crossing the road.
How did I get sight of the snake?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

I have branches, but no fruit, trunk or leaves. What am I?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

What came first, the chicken or the egg?