I am white when I am dirty, and black when I am clean. What am I?

Can you divide the below-given shape into four equal and identical pieces?

An exterior architect is asked by a builder to plant seven trees in a manner that there are exactly six rows of trees in a straight line and each row has three trees in particular.

How will he do it?

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Find three numbers such that

* When we multiply three numbers, we will get the prime numbers.
* The difference between the second and the first number is equal to the third and second.

You have two bottles of pills marked with labels A and B. The pills are identical. The doctor has asked you to take one A pill and one B pill daily. You cant take more or less than that.

While taking out the pills one day, you took out one pill from A and by mistake took out two from B. You have no idea which pill is which now.

You cant throw away the expensive pills. What will you do now?

In a supermarket, there is an intelligent glass pane before a refrigerating unit. This glass pane allows cherries and apples through it but does not allow grapes and Orange to pass through it.

Can you identify the rule that the glass pane is following?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?