In a study of book sales (in thousands) from 5 branches (C1, C2, C3, C4, and C5) of a publishing company for two successive years, the total sales of branch C2 for both years combined is 170 thousand, and the total sales of branch C4 for both years combined is 155 thousand. What is the ratio of the total sales of branch C2 to that of branch C4 for both years?

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?