Identify the hidden meaning behind this picture?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Find the smallest sentence with all the English alphabet.

Prove that twice of ten is the same as twice of eleven.

If Bihan is 10, Anirudha is 20, and Kim and Seal are both 5, but Rikold is 10, how much is Kenniger by the same trend?

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

I make a loud sound when I’m changing. When I do change, I get bigger but weigh less. What am I?

What has 88 keys?