exam Maths Puzzle Numerical Ability

(n-1)(n)(n+1)=210

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exam Other Question

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? graph the function can you please help me with this

f(x)=-2x-5