Answer :
Anna needs to add 1.2 dL of water to the 2 kg of soil which initially contains 12% water to make it suitable for a flower which requires 18% of water.
This question is a simple mathematical problem involving percentages and mass. First, calculate how much water is currently in the soil: 2 kg of soil * 12% = 0.24 kg of water.
Then, calculate the amount of water needed for the flower: 2 kg of soil * 18% = 0.36 kg of water.
To find the amount of water that needs to be added, subtract the initial amount from the desired amount: 0.36 kg - 0.24 kg = 0.12 kg = 1.2 dL (1 deciliter = 0.1 kg). So the answer is that Anna needs to add 1.2 dL of water to the soil.
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