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

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

What has many keys but can’t open a single lock?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

How many times can you subtract the number 5 from 25?

Can you name three consecutive days without using the words Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, or Sunday?

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?

Do You See It?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

How many sides does a circle have?