Answer
(a) Kitchen ratio for given ingredients is $5:2:1$.
(b) The required amount of vegetable oil, sherry vinegar, and salt are $375$ mL, $150$ mL, and $75$ mL respectively.
Work Step by Step
(a) Kitchen ratio for given ingredients is $125:50:25 = 5:2:1$.
(b) If $x$ is a proportion factor for the kitchen ratio in (a) then given that $2x = 150$ mL. Which implies $x = 75$. So, the required amount of vegetable oil, sherry vinegar, and salt are $375$ mL, $150$ mL, and $75$ mL respectively.