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.#penyebut =4+5=9
jdi umur udin. = 4/9×27=12 tahun
x = 4/5 y
maka : 4/5 y + y = 27
9/5 y = 27
y = 27 x 5/9 = 15
x = 4/5 x 15 = 12
jadi umur udin = 12 tahun dan umur samsul = 15 tahun
kiranya membantu..
mimmie