exam Maths Puzzle Numerical Ability

How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that is 50% copper in order to get an alloy that is 30% copper?

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exam Other Question

how do i find the volume of a cylinder with the height of 5? Find the equation, in standard form, with all integer coefficients, of the line perpendicular to 3x - 6y = 9 passing through (-2,-1)