Find the next number in the series below

21 32 54 87 131 ?

A man looks at a painting in a museum and says, “Brothers and sisters I have none, but that man’s father is my father’s son.” Who is in the painting?

Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Why is the Hole below a Lock?

Can you find the thief by just looking at the picture below?

When it's bad luck to meet a black cat?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

Prove that the below maths equation is true.

8 + 8 = 91

Can you solve below mathematical equation?

2^1234 - 2^1233