Replace the question mark with the number below given a simple math problem.

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What work can one never finish?

On my way to St. Ives I saw a man with 7 wives. Each wife had 7 sacks. Each sack had 7 cats. Each cat had 7 kittens. Kittens, cats, sacks, wives. How many were going to St. Ives?

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?

Divide 110 into two parts so that one will be 150 per cent of the other. What are the 2 numbers?

Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

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