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perbandingan umur = 2 : 3
jumlah umur = 15 tahun
maka :
> umur rino = 2/5 x 15 = 6 tahun
> umur rini = 3/5 x 15 = 9 tahun
x 15 = 6 (umur Rino)
x 15 = 9 (umur Rini)