What happened when the wheel was invented?

When I go in I might cause pain. I cause you to spit and ask you not to swallow. I can fill your hole. What am I?

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?

I am the fastest animal but cannot climb the tree. What am I?

Find the last number in the series below:

voN luJ yaM raM ---

In particular commonwealth games, a female participant won silver and gold medals for a single event.

How can this be possible?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I always drive my customer away.

Who am I?

There was a blind beggar living on the footpath of a street. Suddenly one day, the beggar's brother died. What was the relation of the blind beggar with the person who died?

PS: Brother is not the answer.

Through your logical capabilities, can you make 7 an even?