Based on the calculation below, the number lemon juice uses by Eleanor is 321.43ml.
The number lemon juice uses by Eleanor can be calculated using the following formula:
Number lemon juice uses by Eleanor = Number of ml of the salad dressing that Eleanor makes * (5 / (5 + 9)) ........................ (1)
Substituting for the number of ml of the salad dressing that Eleanor makes in equation (1), we have:
Number lemon juice uses by Eleanor = 900ml * (5 / (5 + 9)) = 321.43ml
Learn more about ratios here: https://brainly.com/question/13419413.
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