A friend of mine gave me a hard time to answer his question. It was a simple question like this,

when I was six, my sister was half my age. Now I am seventy, how old is my sister?

I got it wrong though. But everyone is welcome to try. Leave me a comment below and you answer as well.

Good Night everyone.

I just had a hot capuccino earlier, I don't think I am going to sleep now. :)