a is correct, b is not. Redo b first
If the farmer's plot of land is 6 by 18, he has square meters of land. Each square meters yields 2kg of corn, so 108 square meters yield kg of corn. So, the farmer's plot is not enough.
Since every square meter yields 2kg of corn, square meters yield kg of corn. So, in order to yield 600 kg, you need
square meters of plot.
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