Every words stands for unique digit that makes the arithmetic equation true

SEVEN + SEVEN + SIX = TWENTY.

What are the digits ?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

I am the fastest animal but cannot climb the tree. What am I?

Complete the table series riddle by finding the number that can replace "??".

What will you call your mother's brother's brother-in-law?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?