High School

A salad dressing is made by mixing oil and vinegar in the ratio 7:2. Joshua makes 900 ml of salad dressing. How much oil does he use?

Give your answer in millilitres (ml).

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.

Learn more about Ratios here:

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The answer to this question is 700 ML