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100g
Yes, the volume of 300ml and 100ml combined equals 400ml. When you add the two volumes together (300ml + 100ml), the sum is indeed 400ml. This principle applies to any volumes being added together.
if it's water 0.3 kg
In a litre there are 100cl (cl = centi-litre) or 1000ml (ml=milli-litre) 0.3l = 0.3x100cl = 30cl 0.3l = 0.3x1000ml = 300ml So 0.3l does not equal 300cl. It is 30cl or 300ml.
If 3 litres has 10% solution of sugar, the sugar comprises 300ml (i.e. a tenth of 3000). If we want 300ml to be 5% then we need a total of 100/5 * 300 = 6,000ml (6 litres). So we need to add 3 more litres of water. In other words, to halve the percentage of sugar we need to double the total solution from 3 litres to 6 litres.