This puzzle is for Harry Potter fans. Do you know why Tom Riddle is called Lord Voldemort?

Replace the question mark with the correct number in below 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 ?

Which country gets ill every time?

Two in a corner, one in a room, zero in a house, but one in a shelter. What am I?

Prove that the below maths equation is true.

8 + 8 = 91

A brand new Mobile Phone was on sale at 20% as a promotional offer. By what per cent must the Mobile price be increased to sell it at the original price again?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

what does this below rebus represent identXQQQQQME