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

George has two investments that yield a total of $185.60 in annual interest. The amount invested at 8% is $320 less than twice the amount invested at 6%. How much is invested at each rate.

Amount invested at 8%=
Amount invested at 6%= (n-1)(n)(n+1)=210