In the given Venn diagram, circle A represents books, circle B represents pens and circle C, represents pencils. Which number represents only books and pencils?

16

circle A represents books

circle B represents pens

circle C, represents pencils.

Step 1 ) Look at the all figures properly but common part of pencils and books

Step 2) Look at  number represents only books and pencils

Step 3) By visual observations we conclude that 16  is the number which represents only books and pencils