My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ? Select the correct option:
A) 65 B) 72 C) 44 D) 73 E) 89
B   I am 72 years old.   Let m be my age in years. If s is my son's age in years, then my son is 52s weeks old. If g is my grandson's age in years, then my grandson is 365g days old. Thus,   365g = 52s.   Since my grandson is 12g months old,   12g = m.   Since my grandson, my son and I together are 120 years,   g + s + m = 120.   The above system of 3 equations in 3 unknowns (g, s and m) can be solved as follows.   m / 12 + 365 m / (52 x 12) + m = 120 or   52 m + 365 m + 624= 
<gadget id="calculator">+ 624</gadget>
<output>624</output>
624 x 120 or   m= 624 x 120 / 1041 = 72.   So, I am 72 years old.
<result>B</result>
My grandson is about as many days as my son in weeks, and my grandson is as many months as I am in years. My grandson, my son and I together are 120 years. Can you tell me my age in years ?