Question

A salad dressing is made by mixing oil and vinegar in the ratio 7:2. Joshua makes 900ml of the salad dressing. How much oil does he use. Give your answer un milliliters (ml)

Answer 1

Answer: 200 mL of vinegar and 700mL of oil

Explanation:

we should set up a proportion!

7/2 = (oil volume)/ (vinegar volume) = o/v

And o + v = 900 mL

7v = 2o

o = 7v/2

7v/2 + v = 900

7v +2v = 1800

9v = 1800

V = 200 milliLiters ( vinegar)

So o = 900 mL - 200 mL

O = 700 mL (oil)

from MysticAlanCheng

Answer 2

Joshua uses 700ml of oil to make 900ml of salad dressing.

Explanation:

The ratio of oil to vinegar in the salad dressing is 7:2. This means that for every 7 parts of oil, there are 2 parts of vinegar.

To find out how much oil Joshua uses to make 900ml of salad dressing, we need to first calculate the total number of parts in the mixture. In this case, there are 7 + 2 = 9 parts in total.

Next, we can calculate the amount of oil in the mixture by dividing the total volume of the mixture by the total number of parts and then multiplying by the number of parts of oil.

So, the amount of oil Joshua uses is:

(7/9) x 900ml = 700ml