exam Maths Puzzle Numerical Ability

A coffee merchant has coffee beens that sell for $9 p/lb & $12 p/lb. the two types are mixed to to create 100 lb of a mixture to sell for $11.25 p/lb. How much of each type of bean should be used in the mixture?

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Chapter:The Elimination Method
2/3x=2/3-1/6y
y=3x-12
sketch the graph of the polynomial function.

f(x)=(x+1)^3+4