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

If 24H in a D => 24 hours in a day.
What does "64S on CB" stand for?

We know that the number 7 is the prime followed by a cube. Which next number is also a prime followed by a cube?

What is black when you buy it, red when you use it, and gray when you throw it away?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

You measure my life in hours
I serve you by expiring
I vanish faster when I am thin
and slower when I am thick
The wind is my energy
What am I?

You have an empty wine bottle with a cork that has been secured at the top in a normal way. There is a metal ring inside the bottle that is suspended by a string.

How can you make the metal ring drop to the bottom if you are not allowed to touch anything - not the bottle, not the cork, not the thread and not the ring?

In a secret society, a buried chamber can be accessed only via a secret password. The password is seven characters long and comprises of just letters and numbers.

You find a code that can help you in cracking the password. The code says "You force heaven to be empty".

Can you deduce the password from that?

What building has the most stories?