The total expenditure incurred by a person on 7 articles (A1 to A7) is 720. The expenditure on each article is represented in degrees in a pie chart. If the central angle for article A2 is 45° and for article A7 is 60°, what is the ratio of expenditure incurred on article A2 to that on article A7?

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?