exam Maths Puzzle Numerical Ability

For this type of excercise what is the procedure?

(3x+1)(5-10x)>0

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exam Other Question

A metal alloy is 25% copper. Another metal alloy is 50% copper. How much of each alloy should be mixed to create 1000 grams of an alloy that is 45% copper? can you help me to solve for x in terms of y and solve for y in terms of x for the following equation.
3y^2+4xy-9y^2=-1

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