The age of a father 5 years ago was 7 times the age of his son. At present, the age of the father is 5 times the age of his son. Find the age of son .

10 years  15 years  18 years 12 years

15 years

Let the present age of son be x  Present age of father will be 5x  According to question,  \(\frac{x - 5}{5x-5}\) = \(\frac{1}{7}\) 7x - 35 = 5x - 5 2x = 30  x= 15 years  So, age of son is 15 years.