Four years ago,the father’s age was three times the age of his son.The total of the ages of the father and the son after four years,will be 64 years.What is the father’s age at present ?
Choose the correct option:
A) 32 years  B) 36 years  C) 44 years  D) None of these  E) 49 years
Solution   Let the ages of father and son 4 years ago be 3x and x years respectively.   Then,[(3x + 4) + 4] + [(x + 4)+ 4]= 64 ⇔ 4x = 48 ⇔ x =12.   ∴ Father's present age = 3x = 36 years. Answer None of these
<result>D</result>
Four years ago,the father’s age was three times the age of his son.The total of the ages of the father and the son after four years,will be 64 years.What is the father’s age at present ?