I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

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?

You need to remove two matchsticks to make the below equation true. Can you do it ?

A number can be multiplied by multiple of nine
i.e 9 18 27 36 45 ...

and the resulting number consist of only one digit.

Can you identify the number ?

What is the next number in this matchsticks series riddle?

Identify the 10 differences between the two given pictures.

Can you replace the question mark with the correct number in the below table sequence?

Can you find the missing number in the third row?
35 20 14
27 12 18
5 2 ?

If Rajina's daughter is my daughter's mom, who am I to Rajina?

In the Chess Board picture below white army is arranged. You need to add a black army on the board such that no piece is under any threat.
Note: Army comprised of 1 king, 1 queen, 2 rooks, 2 bishops, 2 knights, and 8 pawns.