Question

To make a salad dressing you mix vinegar and olive oil in the ratio 2:5 how much olive oil is needed with 20 ml of vinegar

Answer 1

Explanation:

Set this up as a proportion with the ratios being

`(vinegar)/(oil)` If there is a 2:5 ratio of vinegar to oil, that ratio looks like this:

`(v)/(o):(2)/(5)` and if we are looking for how much oil, x, is needed for 20 ml of vinegar, then that ratio completes the proportion:

`(v)/(o):(2)/(5)=(20)/(x)` and cross multiply.

2x = 100 so

x = 50 ml of oil