Question

Petrolyn motor oil is a combination of natural oil and synthetic oil. It contains 5 liters of natural oil for every 4 liters of synthetic oil. In order to make 531 litersof Petrolyn oll, how many liters of synthetic oil are needed?

Answer 1

The ratio 4 : 5 means that in every 9 liters of oil, we will have 4L of synthetic oil and 5L of natural oil.

Divide the 531 by 9 to get how many times we have to amplify the ratio:

`(531)/(9)=59`

Multiply the ratio by 59:

`4\colon5\rightarrow(4)(59)\colon(5)(59)\rightarrow236\colon295`

Meaning that for the 531L of oil, 236L would be synthetic and 295L natural.

Answer: 236 Liters.