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2 1/4 kg : 57 1/2 ons =
2,25 kg : 57,5 ons =
2,25(10) : 57,5 =
22,5 : 57,5 =
22 1/2 : 57 1/2 =
45/2 : 115/2 =
45/2 × 2/115 =
90/230 =
45/115 =
9/23