Find the next number in the series below

21 32 54 87 131 ?

If 21x = 79x, what is the value of x?

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

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

What is the next number in this matchsticks series riddle?

Rob is taller than Edwin, and Jurgen is shorter than Rob.
Of only one of the following statements, we now certainly know it is correct:

A.Edwin is taller than Jurgen
B.Jurgen is taller than Edwin
C.It cannot be determined if Jurgen or Edwin is the tallest.

If 1+9+8=1, what is 2+8+9?

What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

Which Travels Faster? Solve below famous picture riddle:

1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10