Two years ago a man was six times as old as his son. In 18 years, he will be twice as old as his son. What are their present ages of the man and his son?
Show answer & explanation
Correct answer: B
Explanation
Let the present age of the man be M years and that of his son be S years.
According to the first condition (2 years ago):
...(i)
According to the second condition (in 18 years):
...(ii)
Equating equations (i) and (ii):
Substitute into equation (ii):
Therefore, the present age of the man is 32 years and his son is 7 years.