Transform the word THINK into BRAIN while changing only one letter at a time in a manner that each of the word in the process is a real word!!!

Jim and Sarah are in a long-distance relationship. Jim buys an engagement ring for Sarah and wants to mail it to her. Unfortunately, the only way to ensure the ring will be received is to place a lock on the package. Jim has locks and Sarah has locks, but neither has keys for each other’s locks. How can they make sure the ring isn’t stolen?

Can you place three balls such that the equation shown in the picture holds true?

As we know that white starts the game of chess. Can you find the scenario shown in the picture below is possible when all the white pieces are at the original place while the black pawn is not as in the below picture?

Complete the table series riddle by finding the number that can replace "??".

I taste better than I can smell. Who am I?

Solve the following series:
AZ, GT, MN, __, YB

What has many keys but can’t open a single lock?

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?