**a man is 3 times as old as his son. four years ago, the sum of their ages was 60. how old is each?**

**Answer:**

Let the present age of son be S, and that of man be M

Since the man is 3 times as old as his son, we have

**a man is 3 times as old as his son. four years ago, the sum of their ages was 60. how old is each?**

**Answer:**

Let the present age of son be S, and that of man be M

Since the man is 3 times as old as his son, we have