The following data shows the number of girls and boys in different classes. Find the total number of students across all these classes. Class 5: 88 Girls, 76 Boys Class 6: 140 Girls, 92 Boys Class 7: 54 Girls, 80 Boys Class 8: 84 Girls, 68 Boys Class 9: 90 Girls, 70 Boys

In a data table, the production of rice for country Q and country R is 60 lakh tons and 54 lakh tons respectively. The production of wheat for country S and country T is 52 lakh tons and 52 lakh tons respectively. What is the ratio of the total production of rice of countries Q and R to the total production of wheat of countries S and T?

In a survey of 5 countries (P, Q, R, S, T), the rice production values are 40, 60, 54, 70, and 51 lakh tons respectively. What is the average production of rice (in lakh tons) across all 5 countries?