Can 12 g an 45 kg be expressed as a ratio?

Yes, 12 g and 45 kg can be expressed as a ratio. To do this, both quantities should be in the same unit. Converting 45 kg to grams gives us 45,000 g. Therefore, the ratio of 12 g to 45,000 g can be expressed as 12:45,000, which simplifies to 1:3,750.