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

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

I know there are two methods by using three time the same number with a plus(+) operator , you can make sum as 60.

One of them is 20+20+20.

whats the other way ?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

A man and a dog were going down the street. The man rode, yet walked. What was the dog’s name?

Can you write down eight eights so that they add up to one thousand?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?