A boy purchased a book from a bookkeeper and gave him $100.
The cost of the book is $50 but the bookkeeper has no change, so he gets the change from the next shop and returns the boy his $50.

After some time the next shopkeeper came with the $100 note and told the bookkeeper that the note was a fraud, so he took the money back.

How much loss did the bookkeeper face?

Find the next number in the following series:
6, 14, 26, 98, __?

Solve the following series:
AZ, GT, MN, __, YB

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!!!

Which Travels Faster? Solve below famous picture riddle:

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Which word is least like the others? Third, fourth, fifth, sixth, seventh, eighth, ninth?

Why did the Girl throw the butter out of the window?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

What is in seasons, seconds, centuries and minutes but not in decades, years or days?