A bookshelf contains 100 books of 5 different languages if there are X Latin books and Y Greek books and Z English books how many books are there of other languages?

Answer 1

Well, you really haven't given enough information for it to be answered properly

But if i were going to give it a go:

let X+Y+Z=a

100=a+b+c (where b and c are the other two languages)

and well yea, without anymore information, its pretty much impossible to answer! I mean im no mathematician, perhaps find one, they could probably help you better but really there is not enough information to solve it