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Materi : Perbandingan
Rita = R
Menur = M
Bayu = B
R:M = 3:4
M:B = 2:5
3/4 dan 2/5 Dicocokan agar menjadi R:M:B
= 3/4 dan 4/10
R:M:B = 3:4:10
Jawabannya A.