A man lived a fourth of his life as a boy, a fifth as a young man, and a third as an adult. Then he spend 13 years in his old age. How old was he when he died?
1 Answer
Jul 7, 2018
See explanation.
Explanation:
If we denote the total time the man lived as

as a boy he spent
#x/4# years, 
as a young man :
#x/5# 
as an adult:
#x/3# 
in his old age:
#13# years.
All the above expressions sum up to the man's total age, so that leads to an equation:
Answer:
The man lived for