Question no. 22 please solve 21. 5 kg sugar and 7 kg rice together cost 258, while 7 kg sugar and 5 kg rice together cost
246. Find the total cost of 8 kg sugar and 10 kg rice.
22. One year ago a man was four times as old as his son. After 6 years, his age exceeds
son's age by 9 years. Find their present ages.