If eleven plus two equals one, what does nine plus five equal?

I never stop running even when I standstill. If I am formed by joining two identical bodies together, can you guess who I am?

A rain drop fell from one leaf to another leaf and lost 1/4th of its volume. It then fell to another leaf and lost 1/5th of the volume. It again fell on another leaf and lost 1/5th of the volume.



This process kept repeating till it fell on the last leaf losing 1/75th of its volume.



Can you calculate the total percentage of loss from the initial volume when the drop has fallen to the last leaf accurate up to two decimal places?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Rectify the following equality 101 - 102 = 1 by moving just one digit.

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

There is a wide field of corn. A goose finds its way into the field and starts running. Can you find out till which point the goose can run into the field?

Spot 5 differences in two Christmas tree below:

Jenifer and Jesica are having a conversation.

Jenifer: I am definitely not over 30.
Jesica: I am 28 and you are surely 5 years older to me at least.
Jenifer: No, you are at least 29.

You are told that both of them are lying throughout in the conversation. Can you find their respective ages?

This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?