What is the next number in this series?

4,12,84,3612....

Can you solve the below rebus?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

One day, I thought of ways that can be used for creating a palindrome. So I decided that I will turn into a larger number by adding the reversed digits to the original number and keep doing it till I finally obtained a palindrome.

I am not sure if this process will always result in a palindrome eventually but I was able to produce a four-digit palindrome. Can you guess my starting number?

What four weights can be used to balance from 1 to 30 pounds?

The cream is heavier than Milk. True or False?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

How many bananas can you eat if your stomach is empty?

What has a ring but no finger?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?