What has to be broken before you can use it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?

If eleven plus two equals one, what does nine plus five equal?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

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

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

What is more useful when it is broken?