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

Step-by-step explanation:

Set this up as a proportion with the ratios being

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

and if we are looking for how much oil, x, is needed for 20 ml of vinegar, then that ratio completes the proportion:

and cross multiply.

2x = 100 so

x = 50 ml of oil

a² + b²= c²

24² + 7² = c²

c= 25

stops on an even number.