The age of Amit is 3 times that of his son. 15 years ago, Amit was 9 times as old as his son, What will be the age of Amit after 15 years?  Choose the correct choice
A) 35 years
B) 60 years
C) 75 years
D) 65 years
E) None of these
Let the present age of Amit and his son be x and y respectively.   Then, x = 3y ...(i)   (x -15) = 9(y - 15)   or x - 15 = 9y -135 .   x - 9y = - 120 ...(ii)   Solving (i) and (ii),   we get y = 20 and x = 60   Thus Age of Amit after 15 years = 60 + 15= 
<gadget id="calculator">60 + 15</gadget>
<output>75</output>
75 years   ANSWER:75 years
<result>C</result>
The age of Amit is 3 times that of his son. 15 years ago, Amit was 9 times as old as his son, What will be the age of Amit after 15 years?