The sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be  Choose one:	A) 12 years	B) 20 years	C) 25 years	D) 28 years	E) None
Solution   Let the present ages of son and father be x and (60 - x) years respectively.   Then,	(60 - x) - 6 = 5(x - 6)   = 54 - x = 5x - 30   ‹=›6x = 84   ‹=›x= 14.   ∴Son's age after 6 years = (x + 6) = 20 years.   Answer 20 years
<result>B</result>
The sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be