A man is 4 times as old as his daughter today. Twenty years later, he would be just twice as old. At the time of birth of his daughter, how much old must the man be?
Let the ages of daughter and man today by 'x' and '4x' years respectively.
4x + 20 = 2 (x + 20) ---> As per information
x = 10 years ==> 4x = 40 years.
At the time of birth of his daughter, man must be 40 - 10 = 30 old
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