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  Choose the correct option
A) 38 B) 40 C) 42 D) 44 E) 45
Explanation:   Let the mother's present age be x years.   Then, the person's present age = (2/5 x) years.   =&gt; (2/5 x + 8/2) = 1 (x + 8)   =&gt; 2(2x + 40) = 5(x + 8)   =&gt; x = 40   Answer: Option 40
<result>B</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