To compare the weights, we need to convert them to the same unit. 18 kg is equal to 18,000 grams (since 1 kg = 1000 g), and 16,000,000 mg is equal to 16,000 grams (since 1 g = 1000 mg). Therefore, 18 kg (18,000 g) is the largest, followed by 16,000 g (16,000,000 mg), and then 5,000 g. Thus, 18 kg is the biggest.
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