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R=9/4 ×12=27 tahun
perbandingn umur Desi : Rima = 4 : 9
umur desi = 12
jumlh perbandingan = 4+9 = 13
mka :
Jumlh umur keduanya = 13/4 x 12 = 39 thun
jdi umur Rina = 9/13 x 39 = 27 tahun