There are three teachers, A, B and C. One teaches art, the other music and the other calligraphy. Solve! thank you

"Teacher A is older than the teacher who teaches music" = = = The teacher may teach art and calligraphy.

"Teacher B is older than the art teacher" = = = The teacher may teach music and calligraphy.

The art teacher is younger than Mr. C' = = > Mr. C may teach music and calligraphy.

= = = = = = & gt; Teachers B and C teach music and calligraphy. So Teacher A teaches art. ..

Teacher b is older than the art teacher, and the teacher who teaches art is younger than teacher C.

= = = = = = & gt; Beauty (1). C > beauty (1).

"Teacher A is older than the teacher who teaches music = = = > A (America) > Music teacher

= = = = = = & gt; Beauty (1). C > beauty (1). A (American) music teacher

If there is any contradiction, we can only conclude that A teaches art..