Answer :
Final answer:
Jack used 500ml of oil to make 700ml of salad dressing with a ratio of oil to mayonnaise of 5:2.
Explanation:
In this problem, we have a ratio of 5:2 for oil and mayonnaise in the salad dressing. This means for every 5 parts of oil, there are 2 parts of mayonnaise.
To find out how much oil Jack used to make 700ml of salad dressing with a ratio of oil to mayonnaise of 5:2, we first add both parts of the ratio together (5+2=7).
Then we divide the total amount of salad dressing by the sum of the ratio parts to find out how much one part is equal to (700ml ÷ 7 = 100ml).
Finally, we multiply the amount of one part by the number of parts that are oil (100ml × 5 = 500ml). So Jack used 500ml of oil for his salad dressing.
