How to solve "Jewish" math problems [Maths]

How to solve "Jewish" math problems [Maths]:

Back in the seventies, the mathematics department at the Soviet Union's Moscow State University (one of the most prestigious departments in the USSR at the time) used a special collection of math problems, informally referred to as "Jewish" problems or
"coffins" ("coffin" problems translating roughly to "killer" problems in English), to keep Jewish students and other so-called "undesirables" out of the department. More »

ME HERO DYD