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One litre of milk has mass 1.035 kg. The butter fat content is 4% by volume of the milk and has density 875 kg/m³. If the fat-free skimmed milk has density 'x' g/mL, find x.

1. 1.0
2. 1.02
3. 1.03
4. 1.04

Correct answer: 1.04

Solution

Mass of fat = 40 mL * 0.875 g/mL = 35 g; skimmed mass = 1035 - 35 = 1000 g over 960 mL gives 1.04 g/mL.

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