In the Venn diagram, the 'Triangle' represents 'females', 'Circle' represents 'graduates', the 'Rectangle' represents 'Employed' and the 'Square' represents 'Youth(under 30 years)'. The numbers given in the diagram represents number of persons of that particular category.

How many female graduates who are under 30 years are employed?

5 

The logic followed here is :

Triangle' = 'females'

'Circle' = 'graduates'

 'Rectangle' =  'Employed

'Square' = 'Youth(under 30 years)'.

The number that is common in the circle , square ,rectangle ,triangle represents  who are under 30 years and are employed

clearly 5 lies in the circle , square ,rectangle ,triangle represents  who are under 30 years and are employed