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Ques:- Which of the commodities listed below is the highestforeign exchange earner for India?
A. Tea
B. Coffee
C. Coal
D. Iron ore
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