Question 610105
be a child for one-sixth of his life.
 He shaved after one-twelfth more.
 Grandpa married my grandmother after one-seventh more of his life, and
 five years later they had a son (Uncle Thomas).
 Uncle Thomas lived exactly one half as long as Grandpa.
 Then Grandpa died four years after Uncle Thomas passed.
How many years did my grandpa (James) live?
:
Let a = Grandpa's age 
:
a = {{{1/6}}}a + {{{1/12}}}a + {{{1/7}}}a + 5 + {{{1/2}}}a + 4
Multiply by the LCM (7 * 12 = 84), results:
84a = 14a + 7a + 12a + 84(5) + 42a + 84(4)
84a = 75a + 420 + 336
84a - 75a = 756
9a = 756
a = 756/9
a = 84 yrs grandpa's age when he made his final journey