Study the following graph that shows the number of boys and girls who appeared for the class X examination in a school XYZ, in different years.
What is the ratio of the total number of boys who appeared for the class X examination in 2012 and 2013 to that of girls who appeared in 2012 and 2015?
1
11 : 15
2
11 : 13
3
15 : 11
4
13 : 11