How many times can you subtract the number two from the number fifty?

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.

I make two people out of one. What am I?

I hide my treasure in the ground, my tail is big and fluffy. If you spot me in a tree, please don’t call me scruffy. What am I?

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

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?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What word begins and ends with an E, but has only one letter?

What have one eye but still cannot see?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?