exam Maths Puzzle Numerical Ability

find all positive values for k

x^2+kx+8

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exam Other Question

Mix a solution that is 50%alcohol with a solution that is 10% alcohol to make 300 L of a solution that is 30% alcohol. How much of each should you use? y=19abc/10000 + (ac)2
A=9
B=2007
C=25