What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Can you replace the question mark with the correct number in the below table sequence?

An American nightclub called 'The Coconut Grove' had a terrible fire in which over 400 people died. A simple design flaw in the building led to a high death toll. Subsequently, regulations were changed to ensure that all public buildings throughout the country eliminated this one detail, which proved deadly. What was it?

Can you make numbers like 24, using numbers 3,3,7 & 7 with any arithmetic operator?

If I put in one canary per cage, I have one bird too many. If I put in two canaries per cage, I have one cage too many. How many cages and canaries do I have?

You have two buckets - one holds exactly 5 gallons and the other 3 gallons. How can you measure 4 gallons of water into the 5 gallon bucket?

(Assume you have an unlimited supply of water and that there are no measurement markings of any kind on the buckets.)

This is a classy optical illusion puzzle. What more you can find except bricks in the image below?

What has no start, end, or centre?

People put me on the table and cut me but do not eat me. What am I?