Based on the electricity consumption data of households where: Household P consumed 150 units with a bill of ₹450, Household Q consumed 240 units with a bill of ₹720, Household R consumed 180 units with a bill of ₹500, Household S consumed 120 units with a bill of ₹360, Household T consumed 250 units with a bill of ₹750, Household U consumed 260 units with a bill of ₹780. The cost per unit is exactly the same for which of the following pairs of households?

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?