Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

Take one out and scratch my head, I am now black but once was red. What am I?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Decode the below four famous ciphers:

8P of the SS
1M of the E
1S of the SS
60M in 1H

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

A man was driving a black truck. His lights were not on. The moon was not out. A lady was crossing the street. How did the man see her?

What does this rebus mean?

O
N
C
E
TIME

A bomb exploded in a room full of married couples and no one died. How?