Can you solve the maths in the below-given picture equation?

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

Can you find out the remainder when 3^300 is divided by 5?

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?

The more you take me, the more you leave me behind.
Who Am I?

A cat had three kittens: Snophy, Topsy and Jorden. What was the mother's name?

What is the next shape from answers A, B, C, and D figure?

He loves to dance, twist and prance, he shakes his tail, and as a way he sails, wingless he flies into the sky. What is he?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

How many sides does a circle have?