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x=40 : 4/9 = 40/1 x 9/4 = 360/4 = 90
1/3 x 90 = 90/3 = 30 ml
2/9 x 90 = 180/9 = 20 ml
jadi, jumlah cat yang dibeli = 30 ml + 20 ml + 40 ml + 90 ml