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Rani = x
(x-6) /(x+5-6) = 4/5
(x -6) / (x - 1) = 4/5
5x - 30 = 4x - 4
x = 26
rano = x + 5 = 31
Jadi usia rano 9 tahun mendatang = 31 + 9 = 40 tahun
rani 4:5 rano
rano ? 6+9=15
4:5 = 20:25
=25+15 = 40