The sum of the ages of a father and son is 45 years. Five years ago, the product of their ages was four times the father’s age at that time. The present age of father and son, repectively are Choose the correct choice from the following choices:
A) 25 years , 10 years	B) 36 years, 9 years	C) 39 years, 6 years	D) 40 years, 6 years	E) None of these
Let son’s age = x years. The father’s age = (45 - x) years   we have (x - 5)(45 - x - 5) = 4(45 - x - 5)   =&gt;x - 5 = 4   =&gt; x = 9   Thus, ages are 36 years and 9 years.   ANSWER:36 years, 9 years
<result>B</result>
The sum of the ages of a father and son is 45 years. Five years ago, the product of their ages was four times the father’s age at that time. The present age of father and son, repectively are