Can you solve this picture maths equation?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

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?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?

If in a car race, the man who came two places in front of the last man finished one ahead of the man who came fifth, how many contestants were there?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

I’m orange, I wear a green hat and I sound like a parrot. What am I?

I am an odd number. Take away a letter and I become even. What number am I?

Peter wakes up daily to pick up his cycle and crosses the border between Spain and France daily with a bag on his shoulder. He is investigated daily by the officials but they don't find anything suspicious.

If we tell you that he is smuggling something what would it be?