Ram was married 10 years ago at the age of 27 years and that time his wife was 23 years old. After 6 years of his marrige the average age of Ram, his wife and his son was 21 years. Find the present age of his son. 10 वर्ष पूर्व, राम का विवाह 27 वर्ष की आयु में हुआ था तथा उसी समय उसकी पत्नी की आयु 23 वर्ष थी। विवाह के 6 वर्ष पश्चात् राम के पुत्र और पत्नी तथा राम की औसत आयु 21 वर्ष हो तो पुत्र की वर्तमान आयु ज्ञात कीजिए।