Mister White, Black and Rust are teachers.
There are five subjects to teach : English, French, math, history and geography.

Hints :     1) Mister Black does not comprehend angles.
                  2) Mister White is the only one who knows where the Rocky Mountains are situated.
                  3) Each teaches three subjects.
                  4) No subject is taught by three persons.
                  5) Certain subjects are taught by two people.
                  6) Mister Rust is bilingual.

Question : Who teaches what subjects?

See answer