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.
Ratio is 1/4 20, in total. The minimum numbers of math guys and others to give us the ratio of 10/11 are 10 math guys and 11 others. But we already have 16. so we multiply the ratio by 2, which means that we have to have 20 math guys and 22 others in order to have the ratio of 10/11.