The ration of oil to vinegar in a certain salad dressing is 8:5. how much oil must be blended with 7 liters of vinegar for that recipe?

8/5 = x/7

is it 11.2

Right.

To determine the amount of oil needed to blend with 7 liters of vinegar in a ratio of 8:5, you need to follow these steps:

Step 1: Find the total number of parts in the ratio.
The ratio of oil to vinegar is 8:5, which means there are 8 + 5 = 13 total parts.

Step 2: Calculate the amount of oil needed.
Since the ratio is in terms of parts, you can equate it to the actual quantity. Let's assume 'x' liters of oil is needed.

To find the amount of oil, set up the following proportion:
8 (parts of oil) / 13 (total parts) = x liters (amount of oil) / 7 liters (amount of vinegar).

Using cross-multiplication, you get:
8 * 7 = 13 * x.

Step 3: Solve for 'x'.
56 = 13x.

Divide both sides by 13:
x = 56 / 13.

Therefore, approximately 4.31 liters of oil must be blended with 7 liters of vinegar to make the salad dressing with a ratio of 8:5.