The ratio 3 : 2 means that out of every 5 parts of the mixture, 3 parts are milk and 2 parts are water. The total mixture is 30 litres, which corresponds to 5 parts. One part is therefore 30 ÷ 5 = 6 litres. Milk occupies 3 parts, so the amount of milk is 3 × 6 = 18 litres. Thus, 18 litres of the mixture are milk.
Option A:
Option A, 12 litres, would correspond to only 2 parts of the mixture at 6 litres per part, undercounting the milk portion relative to the given ratio.
Option B:
Option B, 15 litres, arises if one mistakenly assumes equal parts of milk and water, ignoring the 3 : 2 ratio that favours milk.
Option C:
Option C uses the ratio correctly by finding the size of one part and then scaling by the number of milk parts. This fully respects the structure of the ratio and total volume.
Option D:
Option D, 20 litres, would represent 4 parts, which contradicts the defined ratio and implies more milk than the 3 parts specified.
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