Question 114039
 f=father
 d=daughter

 f=4d

   4d+6=3(d+6)

 4d+6=3d+18
-3d  -3d

 d+6=18
  -6 -6
 d=12

 The daughter is 12
 The father is 48

 CHECK

 4d=f

 4(12)=48

 48=48