Ques:- Five years ago, the total of the ages of a father and his son was 40 years. The ratio of their present ages is 4 : 1. What is the present age of the father?
A. 20 years
B. 30 years
C. 40 years
D. 50 years
Ques:- Which of the following is not the main head of expenditureof the central government?
A. Defence expenditure
B. Public health
C. Grants-in-aid
D. Interest of loans