MP Patwari 9-Dec-2017 Shift 2 Paper

The average age of a husband and his wife at the time of their marriage was 25 years. After 7 years, the average age of the husband, wife and his son is 22 years. What is the age of the son at that time? / विवाहु के समय एक पति और पद्वी की औसत आयु 24 वर्ष थी। 7 वर्षों के पश्चात पति, पढी और पुत्र की औसत आयु 22 वर्ष है। इस समय पुत्र की क्या आयु है?