What is the fastest way to double your money?

Trying to tease Birbal, Akbar gave him one gold coin and ask him to buy
* something for him to eat
* something for him to drink.
* something to feed the cows
* something to plant in the garden
and most important you need to buy only one thing.

What must Birbal buy to silence Akbar?

What Deficiency does the below rebus represent?

VIT_MIN

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

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

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

Find out the missing number in the picture attached:

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

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

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?