exam Maths Puzzle Numerical Ability

How many liters of a 50% solution should be added to a 80% solution to obtain a 60% solution?

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exam Other Question

Factor completely. x2 - 11x + 18 In this question I need to use the �discriminant� to determine the number of solutions of the quadratic equation, and whether the solutions are real or complex. I need help please!!

1. 4/3x2 - 2x + 3/4 = 0