What has lots of eyes, but can’t see?

Count the number of balls in picture below:

What does this rebus mean?

O
N
C
E
TIME

There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

Why did the Girl throw the butter out of the window?

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

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 ?