The sum of the present ages of a man and his son is 45 year. 5 years ago product of their ages was 4 times that of age of man. Find their present age
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The present age of man is 36 years and that of son is 9 years.
1) Let the age of man be x,
According to the first statement the age of son would be 45-x
2) According to the second statement, the product of their ages 5 years ago was 4 times the age of man.
Age of man 5 years ago = x-5
Age of son 5 years ago = 40-x
Equation : (x-5)(40-x)= 4(x-5)
3) Eliminating the common term from both sides, x=36
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