Once while in his court, King Akbar asked Birbal to write something on a wall that makes one sad when read in good times and makes one happy when read in sad times.

He took only a few moment and wrote something that fit the requirements. What did he write?

Find out a multi-digit number that if multiplied by the number 9 or any of its multiplications products (i.e. 18, 27, 36, 45,..) will result in the multiplication factor repeated (n) number of times.

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

Why is 6 afraid of 7?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Who always enjoys poor health?

Using eight eights and addition only, can you make 1000?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3