Answer :
Final answer:
To find the amount of lemon juice used, divide 700ml into 7 equal parts, each measuring 100ml. Multiply the number of parts of lemon juice (4) by the size of each part (100ml) to find the amount of lemon juice used: 4 parts x 100ml = 400ml.
Explanation:
To find the amount of lemon juice used, you need to determine the ratio of lemon juice to the total mixture and then calculate the corresponding amount. In this case, the ratio is 4:3, which means that for every 7 parts of the mixture, 4 parts are lemon juice and 3 parts are vinegar. Since there are 700ml of mixture, you can divide it into 7 equal parts to find the amount of each part, which is 100ml. Therefore, the amount of lemon juice used is 4 parts of 100ml, which equals 400ml.
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