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  Answers:  A) 42  B) 22  C) 20  D) 40  E) 26
Let the mother's present age be X years.   Then, the person's present age = 2/5 X years.   THEREFORE (2/5 X + 8) = 1/2 (X+8)   2(2X + 40) = 5(X + 8)   X = 40   ANSWER:40
<result>D</result>
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