What mass in kg is double 3 kg 750g?

To find the mass in kilograms of double 3 kg 750 g, first convert 3 kg to grams by multiplying by 1000, which equals 3000 g. Then add the 750 g to get a total of 3750 g. Doubling this value gives you 7500 g. Finally, convert 7500 g back to kilograms by dividing by 1000, which equals 7.5 kg.