Answer :
Final answer:
To determine the amount of oil Joshua uses, we need to find the fraction of the salad dressing that is oil. The ratio of oil to vinegar is 7:2, which can be simplified to 7/9 and 2/9. Multiplying the fraction of oil by the total volume of salad dressing gives us the amount of oil used.
Explanation:
To find the amount of oil Joshua uses, we need to determine the fraction of the salad dressing that is oil. The ratio of oil to vinegar is 7:2, which can be simplified to 7/9 and 2/9. So, for every 7 parts of oil, there are 2 parts of vinegar. Since the total amount of salad dressing made is 900ml, we can set up the equation:
7/9 * Total volume = amount of oil
7/9 * 900ml = 700ml
Therefore, Joshua uses 700ml of oil.
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