The 1954 Statelessness Status Convention provided a definition of a stateless person (which has since become part of customary international law, according to the International Law Commission), and sets out a number of rights that stateless persons should enjoy.
The ratio of two integers P and Q can be expressed as P : Q or P/Q. In both cases, you may divided P and Q by their greatest common factor so as to express the ratio in its simplest form.
Any integer can be written as the product of two other integers. Even prime numbers can be written as the product of 1 and the number itself. Thinking of a number as the product of two factors can require backwards thinking - you essentially must ask yourself, what multiplication problem equals this number?