A farmer applied 60 kg of NPK 15:15:15 fertilizer to a plot of land. How many kilograms of nitrogen did the farmer apply?
A6 kg
B9 kgCORRECT
C12 kg
D15 kg
GCEAgricultural ScienceCrop Production2022
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Why the answer is B, and why the others tempt you.
NPK 15:15:15 means the fertilizer contains 15% nitrogen by weight. Applying 60 kg of this fertilizer gives: $60 \times \frac{15}{100} = 9$ kg of nitrogen. Distractors represent common errors such as using 10%, 20%, or 25% instead of 15%.
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