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?  Pick:
A) 32 years	B) 36 years	C) 40 years	D) 48 years	E) None
Solution   Let the mother's present age be x years.Then, the person's present age	= (2/5 x) years.   Therefore	=[2/5x+8]   = 1/2(x+8)   = 2(2x+40)   =5(x+8)   = 40 year   Answer 40 years
<result>C</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?