tolong ya dijawab+kasih cara....jangan cmn ngincer poin!!!!!!

T : F : C = 3 : 2 : 4
T- 4 = F

T : (T-4) = 3 : 2
         2T  = 3 (T-4)
               = 3T-12
            T = 12
           
Jumlah usia mereka = 3+2+4 / 3 x 12
                                   = 9/3 x 12
                                   = 36