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.)

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Solve this riddle by finding the odd one out from the rest.

What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What happened when the wheel was invented?

Can you spot the man between the coffee bean in the picture below ?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

What kind of storm is always in a rush?

You need to move three matchsticks to form three squares. Can you do it?

What does below chemistry rebus means?