Jawabanmu

2014-05-08T14:51:38+07:00
Misal,umur Resa = r
         umur Tere = t
r = 2t
umur mereka skrg:
(r + 2) + (t + 2) = 40
⇔(2t + 2) + (t + 2) =40
⇔2t + 2 + t + 2 =40
⇔3t =40 - 2 - 2
⇔t=36:3
⇔t = 12

umur Resa = 2t =2.12 =24 tahun
c.24