A father is now three times as old as his son. Twelve years ago he was six times as old as his son. How old are the son and the father?

Correct Answer: Option E

Explanation:
Son = x, Father = 3x, 12 yrs ago
son = x - 12, father = 3x - 12
3x - 12 = 6(x - 12)
3x - 12 = 6x - 72
3x = 60
x = 20

A father is now three times as old as his son. Twelve years ago he was six times as old ...