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

What does below rebus means ?

The more you take me, the more you leave me behind.
Who Am I?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

If a boy blows 18 bubbles,
Then pops 6 eats 7 and then
He pops 5 and blows 1.
How many are left?

What word does this rebus represent?

meta meta
meta meta

What is common among 11, 69, and 88?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Solve the mathematical equation in the picture below.

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?