Ten years ago, a mother was four times older than her daughter. After ten years, the mother will be twice older than daughter. The present age of the daughter is  Answers.
A) 22	B) 21	C) 24	D) 20	E) 19
Let the mother’s present age be ’x’   Let the daughter’s age be ’y’;   10 years ago; (x - 10) = 4(y - 10) or x - 4y = - 30.. (1)   10 years later; (x + 10) = 2(y + 10) or x - 2y = 10.. (2)   Solving (1) &amp; (2)   y = 20   ANSWER:20
<result>D</result>
Ten years ago, a mother was four times older than her daughter. After ten years, the mother will be twice older than daughter. The present age of the daughter is