I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

How many words can a quill made with the feather of a pigeon write with a 100ml bottle of black ink?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What is black when you buy it, red when you use it, and gray when you throw it away?

A mile-long train is moving at sixty miles an hour when it reaches a mile-long tunnel. How long does it take the entire train to pass through the tunnel?

You bought me for dinner but never eat me. What am I?

Who has married many women but was never married?

A kind heart person buy packed food at 3$/packet from United states and sells them at 1$/packet at Africa. After some time he becomes a millionaire.

How come the guy become millionaire ?

I welcome the day with a show of light, I stealthily came here in the night. I bathe the earthy stuff at dawn, But by noon, alas! I'm gone.

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?