A person's present age is two-fifth of the age of his mother. After 10years, he will be one - half of the age of his mother. How old is the mother at present ?
Choose one.
A) 45	B) 30	C) 50	D) 25	E) 31
Let the mother's present age be x years   Then the person's present age = 2x/5   (2x/5)+10 = 1/2(x+10)   2(2x+40) = 5 (x+10)   x = 50   Answer is 50
<result>C</result>
A person's present age is two-fifth of the age of his mother. After 10years, he will be one - half of the age of his mother. How old is the mother at present ?