Read the following and answer the questions that follow.

The Govind Public school with classes 9 to 12 has a total of 1230 students, consisting of both girls and boys. In Class 11, the ratio of girls to boys is 6 : 7, with the number of boys exceeding girls by 30. In Class 9, the number of boys is 20 more than that in Class 10. The number of girls in Class 10 is 25 more than that in Class 9. The number of girls in Class 11 is 5 more than the number of boys in Class 12. The combined strength of Classes 9 and 10 compared to the combined strength of Classes 11 and 12 is in the ratio 103 : 143. Additionally, the ratio of boys to girls in Class 10 is 5 : 8.