Solution for #18Alternate Solution #1 Let x be the age of the man at the time of his death. His age consists of the number of years he spent as a child plus the number of years he spent as a teenager plus the number of years between his coming of age and his marriage plus five plus his son's age (half his own) plus four. In mathematical terms, this is: x = x/6 + x/12 + x/7 + 5 + x/2 + 4 So the man lived to be 84 years old. Alternate Solution #2 The man lived 1/12 of his life as a teenager. There are seven teen years. 7 × 12 = 84. 
