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

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?

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

Replace the question mark with the correct number below.

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

Why do Chinese men eat more rice than Japanese men do ?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?