In the following Venn diagram,the Pentagon’ stands for ‘Architects’, the 'Circle' stands for ‘Morning-walkers’ and the 'Square' stands for ‘Diploma holders’. The given numbers represent the number of persons in that particular category.

How many diploma holders are also morning-walkers but NOT architects?

40

The Pentagon’ stands for ‘Architects’.

The 'Circle' stands for ‘Morning-walkers

The 'Square' stands for ‘Diploma holders

Step 1 ) Look at the figure of  Diploma holders and Morning-walkers

Step 2) Look at those number in which only those diploma holders are also morning-walkers but NOT architects That is 40

Step 3)  By visual representation we can conclude 40 is the number that are diploma holders are also morning-walkers but NOT architects