SSC CPO 9 Dec 2019 Shift 1 Paper

The Venn diagram given below shows the artists in a Music School. The ‘Triangle’ represents ‘Pianists’, ‘Circle’ represents ‘Drummers’; the ‘rectangle’ represents ‘Guitarist’ and the ‘Square’ represents ‘Singers’. The numbers given in the diagram represent number of person of that particular category. How many singers are also pianist and guitarist but not Drummers?