A goat farm has 30 goats. Each goat gives 0.5 litre of milk during the first week. After the second week, the milk yield per goat drops by 20%. How many litres of milk will the farmer get from the farm in the second week?
Answer
12 litres
The correct answer is 12 litres — Step 4: The total milk in the second week is 12 litres.
Step-by-step solution
- Step 1: Find milk per goat in first week: 0.5 L.
- Step 2: Apply 20% drop for second week: 0.5 L × (1 − 0.20) = 0.5 L × 0.80 = 0.4 L per goat.
- Step 3: Multiply by number of goats: 30 goats × 0.4 L = 12 L.
- Step 4: The total milk in the second week is 12 litres.
Common mistake: Applying the percent drop to total milk instead of per goat
Concept tested: Milk yield percentage change
Published · How this solution was prepared and checked
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