1 + 9 + 8 = ?
considering, 28 + 8 + 92 = 10

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What does this rebus means ?

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Today is a very icy and cold morning in Newcastle. Mr Shearer, an office bus driver arrived to pick up the employees from the last stop. Shearer suddenly remembers that he needs to pick a newly joined 4miles to the north. Mr Shearer lost his direction compass, a few minutes later Shearer is able to figure that he is moving in the correct direction i.e. north. How did Shearer know that he is moving in the correct direction?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

What does below science rebus mean?

Ag Ag Ag
Ag SPOON Ag
Ag Ag Ag

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

If six children and two dogs were under an umbrella, how come none of them got wet?

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