How many times can you subtract the number two from the number fifty?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

What you cannot hold but it is yours?

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?

One day, John and his friends were playing around. Jacob hit something with a Pin and it popped. John's dad came into the room that very moment, but he wasn't mad. In fact, he was smiling. What did Jacob hit?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

I came first on earth but second on the heaven.
I also came twice in a week but found just once in a year.
I stay away from months but you can find me in February.

What am I?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

If an electric train is travelling south, then which way is the smoke going?

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