A person's present age is two-fifth of the age of his mother. After 4 years, he will be one - half of the age of his mother. How old is the mother at present ?
Choose the correct choice from the following answers:  A) A)25  B) B)40  C) C)20  D) D)45  E) E)28
Let the mother's present age be x years   Then the person's present age = 2x/5   (2x/5)+4 = 1/2(x+4)   2(2x+20) = 5 (x+4)   x = 20   Answer is 20
<result>C</result>
A person's present age is two-fifth of the age of his mother. After 4 years, he will be one - half of the age of his mother. How old is the mother at present ?