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A salad dressing is made by mixing lemon juice and oil in the ratio 5:4. Eleanor makes 900 ml of the salad dressing. How much lemon juice does she use? Give your answer in millilitres (ml).

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Final answer:

Eleanor uses 500 ml of lemon juice for 900 ml of salad dressing following a ratio of 5:4 of lemon juice to oil.

Step-by-step explanation:

The student has asked how much lemon juice Eleanor uses to make 900 ml of salad dressing with a ratio of 5:4 of lemon juice to oil. To solve this problem, we first need to find the total number of parts in the ratio. There are 5 parts lemon juice and 4 parts oil, adding up to 9 parts in total. Now, we need to divide the total amount of salad dressing by the number of parts to find how much each part is:

900 ml ÷ 9 parts = 100 ml per part

Now that we know each part is 100 ml, we can calculate the amount of lemon juice, which is 5 parts:

5 parts × 100 ml/part = 500 ml of lemon juice

Therefore, Eleanor uses 500 ml of lemon juice to make 900 ml of salad dressing.

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