Can you decipher the below rebus?

PBLUESAISNUERSES

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!!!

The doctor advised his patient to take a tablet after every fifteen minutes. He gave him five tablets in total.

How much time will he take to have all the five tablets?

Forwards I am heavy, backward I am not. What am I?

While going to your grandmother's house, you counted Twenty houses on the right side. While returning back to your home, you counted Twenty houses on the left side.

How many houses are there between your home and your grandmother's home?

What number do you get when you multiply all of the numbers on a telephone's number pad?

What is both possible and impossible at the same time?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

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?

Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?