A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?
Answer & explanation
Correct answer: option 4
Let the mother's present age be x years.
Then, the person's present age = 2/5* x years.
2/5*x+8= 1/2 (x+8)
2(2x + 40) = 5(x + 8)
x = 40.