Final answer:
To determine the fraction of liquid fertilizer in the final mixture, the volume of the liquid fertilizer (18 oz) is divided by the total volume of the mixture (54 oz), resulting in a fraction of 1/3.
Step-by-step explanation:
To find the fraction of liquid fertilizer in the final mixture, you would add the volume of the liquid fertilizer to the volume of water to get the total volume of the mixture. In this case, you have 18 oz of liquid fertilizer and 36 oz of water. Adding these together, the total volume of the mixture is 18 oz + 36 oz = 54 oz.
The next step is to express the volume of liquid fertilizer as a fraction of the total volume. Since the fertilizer is 18 oz and the total mixture is 54 oz, the fraction would be 18 oz / 54 oz, which simplifies to 1/3 when divided by 18, the greatest common divisor.
Therefore, the fraction of liquid fertilizer in the mixture is 1/3. So, the correct answer is Option A) 1/3.