SOLUTION: father tells son he was his present age when he was born, Father's present age was 36 now, how old was the boy 05 yrs back

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Question 756638: father tells son he was his present age when he was born, Father's present age was 36 now, how old was the boy 05 yrs back
Answer by lwsshak3(11628) About Me  (Show Source):
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father tells son he was his present age when he was born, Father's present age was 36 now, how old was the boy 05 yrs back.
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let x=son's present age and father's age when son was born
2x=father's present age.
2x=36
x=18
5yrs back:
The boy was x-5=13 yrs