exam Maths Puzzle Numerical Ability

Petrolyn oil is a combination of natural oil and synthetic oil-- 3parts natural oil for every 5 parts of synthetic oil. How many liters of Petrolyn oil can be made from 400 liters of synthetic oil?

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exam Other Question
Simplify the expression. please help explain how to get the answer? it was a multiple choice question, thanks!

(x^4)(x^2/3)/x


A.) x^3/40 B.) x^13/40 C.)x^11/3 D.) x^11/20 x to the power of 2 + 2x - 15