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

What is the largest number you can write with just 3 digits?

In a rainy season, one day 3 huge ladies walked under a normal-sized umbrella.
The umbrella is not huge enough to accommodate all 3 ladies yet not a single lady got wet. Why?

What has lots of eyes, but can’t see?

Can you find out who is the kidnapper in below Picture and why, Explain ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

The more of this there is, the less you see. What is it?

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?