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!!!

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

using four eights (8) and a one (1) and one mathematical symbol , create the number 100

John left on a horse on Thursday , was gone for two days, and came back on Thursday after completing his work. How did that happen?

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?

I am beautiful, up in the sky. I am magical, yet I cannot fly. To people I bring luck, and to some people, riches. The boy at my end does whatever he wishes. What am I?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"