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

Find the smallest sentence with all the English alphabet.

Write the next letter in this sequence.
O, T, T, F, F, S, S, E, __
**Hint: It is a Number Series Puzzle

Can you count the number of blocks in the picture below?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

You have two strings whose only known property is that when you light one end of either string it takes exactly one hour to burn. The rate at which the strings will burn is completely random and each string is different. How do you measure 45 minutes?

A Man gave one of his sons 10 cents and another son was given 15 cents. What time is it?
Hint: Figure out the relation between time and number, is not so easy..:)

What is the next shape from answers A, B, C, and D figure?

Why 1729 is a magic number? Answer Logically.

Find the next number in the sequence

1, 2, 6, 21, 88, __?