A student's marks in different subjects out of 100 are represented. If the marks scored in Hindi and Mathematics are 70 and 90 respectively, and the marks scored in English and Science are 55 and 80 respectively, then the total marks scored in Hindi and Mathematics are more than the total marks scored in English and Science by:

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?