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s = 4 + t
(t+5) : (s+5) = 2 /3
3(t +5 ) = 2(s + 5)
3t + 15 = 2s + 10
3t = 2s - 5
3t = 2(4+t) - 5
3t = 8 +2t -5
t = 3 th
s= 4 +t = 4 +3 = 7th
10 th akan datang
t + 10 + s + 10 =...
3 + 7 + 20 = 30 tahun