Which country gets ill every time?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

I have branches, but no fruit, trunk or leaves. What am I?

What has many keys but can’t open a single lock?

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

In a box, there is a jumble of 7 red balls, 6 blue balls, 5 green balls, and 4 yellow balls. What is the minimum number of balls, will you have to pick up so that you have at least 4 balls of the same colour?

What is more useful when it is broken?

Count the number of triangles in the picture below:

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()