exam Maths Puzzle Numerical Ability

please help me solve this:
(a^(4/9)/256b^6c^2)^(-1/4)

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exam Other Question

How do you solve y when doing this equation on a graph? (2x - 3y = 12) A coffee merchant has coffee beens that sell for $9 per pound and $12 per pound. The two types are to be mixed to create 100 lb. of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?