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

What is more useful when it is broken?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Begin with a word, five letters to my name,
Remove the first and last but I am the same
Take out my middle and still, I remain.
What word am I?

How can you take 2 from 5 and leave 4?

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?

O_er_t_o_

Complete the missing letters of the given word.

My thunder comes before the lightning; my lightning comes before clouds; my rain dries all the land it touches. What am I?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

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?