exam Maths Puzzle Numerical Ability

C and Y candy Company mixes candy that costs $6.00 per kg with candy that costs $4.50 per kg. How many kilograms of each are needed to make a 3 kg box that costs $15.00?

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Can someone direct me:

5x^2 = 100

Thank you so much. What type of solution do you get for quadratic equations where D < 0? Give reason for your answer. Provide an example of such a quadratic equation and find the solution of the equation.