Replace the question mark with the number below given a simple math problem.

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 ?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What does this rebus mean?

O
N
C
E
TIME

I am an odd number. Take away a letter and I become even. What number am I?

Can you count the number of lines in the below picture?

Can you fill the blank with the correct number?

6 30 870 756030 _____

Place the numbers from 1 to 9 in the circles in a manner that each side of the triangle sums up to 17.

The below mentioned letters have been placed in a order using a logic.

DEAD, BALL, FEAR, SHOP

Can you find the logic?

What does it mean?