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

A mathematician couple was having a Frappuccino in Starbucks sitting opposite to each other. Suddenly the guy noticed the text written on the paper in front of them and exclaimed that it was wrong. The girl denied it and said it is appropriate. Both are correct. What is written on the paper?

Which Number is the odd one out?

A) 7145
B) 2716
C) 5321
D) 4135

If in a code language, DISTANCE is written as IDTUBECN and DOCUMENT is written as ODDVNTNE, the how will THURSDAY be coded as in the same language?

There is so small cabin inside a deep forest.
All the forest burned out to worst possible but the inside of the cabin is still the same.
However all the person inside the cabin die.

How come ?

A bomb exploded in a room full of married couples and no one died. How?

How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Can you find out the total number of triangles in the given figure?

Below, you can see some coding:
January = 1017
February = 628
March = 1335
April = 145
May = 1353
June = 1064
July = 1074
August = 186

Now deciphering the way it has been coded, can you find out how September will be coded?

Be active and find the killer in the picture Riddle below.