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

How many bananas can you eat if your stomach is empty?

Can you tell a 3D object that has just two surfaces?

What brings you down but never up?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

A mother bought three dress for her triplets daughters(one for each) and put the dresses in the dark. One by one the girls come and pick a dress.
What is the probability that no girl will choose her own dress?

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

What number comes next in this sequence:
7 8 5 5 3 4 4 _

Can you solve the photo plexer logic ?

While handling a project, the landscaper is asked by the owner of the mansion that he wants four trees in front of his mansion that are exactly equidistant from each other.

How will he do it?