Question 1195876
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Here is a simple non-algebraic way to solve a two-part "mixture" problem like this that gets the answer to this particular example very fast, because the numbers are "nice".<br>
Observe (perhaps using a number line, if it helps) that 13% is 4/5 of the way from 9% to 14%.
That means 4/5 of the mixture is the one with 14% vinegar.<br>
ANSWER: 4/5 of 360ml, or 288ml, of the 14% vinegar dressing; the other 72ml of the 9% vinegar dressing.<br>