In the given Venn diagram, the triangle represents politicians, the circle represents lawyers, the rectangle represents teachers and the square represents businessmen. The numbers given in the diagram represent the number of persons of that particular category.

How many lawyers are also teachers, but are neither politicians nor businessmen?

18

The triangle represents politicians

The circle represents lawyers

The rectangle represents teachers 

The square represents businessmen

Step 1 ) Look at the figure of  Circle , Triangle, Rectangle , Square

Step 2) Look at  number given in lawyers are also teachers, but are neither politicians nor businessmen That is 18

Step 3) By visual observations we conclude that 18  is the number which represents lawyers are also teachers, but are neither politicians nor businessmen