the present average age of a couple and their daughter is 35 years. Fifteen years from now, the age of the mother will be equal to the sum of present ages of the father and the daughter. Find the present age of mother?
Choose the correct choice from the following answers.
A) 22 years	B) 77 years	C) 76 years	D) 45 years	E) 56 years
(f + m + d)/3 = 35   =&gt; f + m + d = 105 --- (1)   m + 15 = f + d   Substituting f + d as m + 15 in (1), we get   2m + 15 = 105   2m = 90 =&gt; m = 45 years.   Answer: 45 years
<result>D</result>
the present average age of a couple and their daughter is 35 years. Fifteen years from now, the age of the mother will be equal to the sum of present ages of the father and the daughter. Find the present age of mother?