The marks (out of 150) of five students in different subjects are given in the following table: Subject/StudentHindiEnglishPhysicsChemistryMathematicsRavi135140132121141Deepak120135139112136Sarita11012612097130Kamal13012598102120Divya136130101100115 The percentage of marks scored by Ravi in Mathematics is:

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?