The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

I have eight fingers and two thumbs but I do not live. What Am I?

Baseball bat and ball cost $100. If the bat cost $99 more than the ball, what is the cost of each?

Which alphabet letter is a question?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

4 fathers, 2 grand-fathers and 4 sons went to watch the movie.What is the minimum number of tickets they need to buy ?

12345 a famous South Indian actor
567 is a path in jumbled form
8 & 10 are same letters
9 is one among the first six alphabets.
WHO AM I?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

0 0 0 = 6
1 1 1 = 6
2 2 2 = 6
3 3 3 = 6
4 4 4 = 6
5 5 5 = 6
6 6 6 = 6
7 7 7 = 6
8 8 8 = 6
9 9 9 = 6

You can use any mathematical symbols in the space provided to make all above algebraic expressions true.

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...