How many sides does a circle have?

I sleep during the day and fly at night, but I have no feathers to aid my flight. 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?

What has one letter and starts with an E?

I’m light as a feather, yet the strongest person can’t hold me for five minutes. What am I?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What jumps when it walks and sits when it stands?

During which month do people sleep the least?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

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