exam Maths Puzzle Numerical Ability

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9x^2=14

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exam Other Question

Anne and Nancy use a metal alloy that is 19.75% copper to make jewalry. How many ounces of an 18% alloy must be mixed with a 21% alloy to form 108 ounces of the desired alloy? how do you find the b and solution of this equation? y=-3/4x