In a family, the combined age of husband, wife and a son is 90 years. The husband is the oldest. The difference in the ages of the husband and wife is...
Question
In a family, the combined age of husband, wife and a son is 90 years. The husband is the oldest. The difference in the ages of the husband and wife is 1/3rd the age of their son. After 10 years, the age of the son would be half the age of his father. What is the present age of his mother (in years)?