age of mr stone
Ben wanted to know how old his friend Mr. Stone was. Mr. Stone told him, "I started school when I was 4-1/2 year old, and I stayed at the same school for 1/6 of my life. I was in the army 1/5 of my life and when I left the army I spent 1/4 of my life as a clerk. Now I have spent 1/3 of my life in retirement." How old is Mr. Stone?
The answer is 90.
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1 solution
1-(1/6+1/5+1/4+1/3)=1/20 So he passed 1/20 of his life,which is 4.5 years before joining school. Then his age is 4.5x20=90