In the given diagram, the circle represents ‘teachers’, the triangle represents ‘dancers’ and the rectangle represents ‘writers’. Study the given diagram carefully and answer the question that follows.

What is the number of teachers who are writers, but NOT dancers?

10

The circle represents ‘teachers’

The triangle represents ‘dancers'

The rectangle represents ‘writers’.

1) From the above figure we conclude that 10 is the number  of teachers who are writers, but NOT dancers