In the given Venn diagram, the ‘rectangle’ represents ‘travellers who like to travel by plane’, the ‘circle’ represents ‘travellers who like to travel by bus’, and the ‘triangle’ ‘represents travellers who like to travel by train’. The numbers given in the diagram represent the number of travellers in that particular category.

How many travellers like to travel either by train or plane but NOT by bus?

30

The ‘rectangle’ represents Travellers who like to travel by plane

The ‘circle’ represents ‘travellers who like to travel by bus

The ‘triangle’ ‘represents travellers who like to travel by train

Step 1 ) Look at the figure of  rectangle , Triangle

Step 2) Look at  number given in is aTravellers like to travel either by train or plane but NOT by bus

Step 3) By visual observations we conclude that (11+ 13 + 6 = 30)  is the number which represents travellers like to travel either by train or plane but NOT by bus