The present age of the father is five times the age of the son. Five years ago, the age of the father was ten times the age of his son at that time. How old is the father at present?
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present age of son=x
present age of father=5x
5 years ago ,
father age =5x-5
son age = (x-5) ×10
then,
5x-5=(x-5)*10
5x-5=10x-50
-5+50=10x-5x
5x=45
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