In the  following Venn diagram, the hexagon stands for 'captains', the triangle stands for 'girls', the rectangle stands for 'toppers', and the circle stands for 'social activists/. The given numbers represent the number of persons in that particular category.

How many girls are toppers and captains also ?

13

The hexagon stands for 'captains'

The triangle stands for 'girls'

The rectangle stands for 'toppers'

The circle stands for 'social activists.

The given numbers represent the number of persons in that particular category.

Step 1 ) Look at the all figures properly but common part of girls are toppers and captains also

Step 2) Look at number represents the girls are toppers and captains also

Step 3) By visual observations we conclude that 8 + 5 = 13   is that part number which represents 'both  buttons and bottle