John’s mother is thrice his age. 11 years from now, his mother’s age will be twice that of his. How old is his mother?
Answer
Let j and m be John’s and his mum’s age respectively. Based on this, you can come up with 2 equations:
1st equation: 3j = m
2nd equation: 2j = m + 11
Solving for j and m gives 11 and 33 respectively.
John’s mother is 33 years old.