§ 12.4 (1) £ 17.5 § 12.5 (1)$ 5474.94 § 12.6 (1) £ 90.64 (2) = \(\frac{5}{6}\) (3) £ 168 §12.7 (1) 93∶ 80 (2) 2-4 (3) 125 (4) a: b: c = 12∶ 10∶15
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