exam Maths Puzzle Numerical Ability

Solution K is 30% alcohol and solution W is 50%. How much of each should be used to make 300 l of a 40% solution?

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exam Other Question

6+i-1-7i Write an equation for the ellipse with end points of the major axis at (7,1) and (-7,1) and end points of the minor axis at (0,5) and (0,-3).

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