What four weights can be used to balance from 1 to 30 pounds?

I have a mouth but I don't eat.
I have a bank but have no money.
I have a bed but i dont sleep.
I wave but have no hands.

Who Am I ?

Take 9 from 6, 10 from 9, 50 from 40, and leave 6.

How Come ??

What is the largest amount of money that you can possess in change and still if someone asks you for a dollar, you won't be able to give?

What occurs twice in a week, once in a year but never in a day?

There was once a college that offered a class on probability applied to the real world. The class was relatively easy, but there was a catch. There were no homework assignments or tests, but there was a final exam that would have only one question on it. When everyone received the test paper it was a blank sheet of paper with a solitary question on it: 'What is the risk?'.Most students were able to pass, but only one student received 100% for the class! Even stranger was that he only wrote down one word!
What did he write?

What can you hold in your right hand, but never in your left hand?

Which Travels Faster? Solve below famous picture riddle:

The Little ant seems to be always confused. Do you know why?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?