Count the Books on Shelf

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?




Similar Riddles

You are given 2 eggs.
You have access to a 100-storey building.
Eggs can be very hard or very fragile means it may break if dropped from the first floor or may not even break if dropped from 100th floor, Both eggs are identical.
You need to figure out the highest floor of a 100-storey building an egg can be dropped without breaking.
Now the question is how many drops you need to make. You are allowed to break 2 eggs in the process

Asked by Neha on 12 Dec 2025


Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

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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?

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What breaks yet never falls, and what falls yet never breaks?

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A car is crossing a 20 km-long bridge. The bridge can support at most 1500kg of weight over it. If somehow, the weight on the bridge becomes more than that, it will break.

Now, the weight of the car is exactly 1500kg. At the midway, a bird comes and sits on the roof of the car. This bird weighs exactly 200 grams.
Can you tell if the bridge breaks at this point or not?

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Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

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Before the start of the car race, John and Jacob have the same amount of fuel in their car. With this fuel, John can drive for 4 hours while Jacob can drive five hours.
After a time they realize that the amount of fuel left in John's car is 1/4th of the fuel in Jacob's.

For how long they are racing?

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How much will a 38° angle measure when looked at under a microscope that magnifies ten times?

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In the image below, you can see two glasses and two matchsticks.You need to move four matchsticks in such a manner that the crosses come inside the glasses. Note: you cannot move the crossed.

Fun With Matchsticks

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Find the next number in the series

12, 20, 40, 72, 116, 172 ?

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Gambling

In Canada, a mathematical puzzle must be solved in order to win the lottery to classify it as a “game of skill” not gambling.