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

How many pluses should we put between the digits of 987654321 to get a total of 99, and where?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

What number should come in place of the question mark below?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?

The day before yesterday I was 25 and the next year I will be 28. This is true only one day in a year. What day is my birthday?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John said, "If yesterday was tomorrow, today would be Friday."

When did John make this statement?

If we tell you that there is a relation between the numbers and letters in the given figure, can you analyze it and find the missing letter in the last box?

Can you find out the remainder when 3^300 is divided by 5?