exam Maths Puzzle Numerical Ability

Solve by quadratic Equation.
3x^2-6x+2=0

Please explain.

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exam Other Question

My question is combination word problem and cost function. I struggle a lot with these. Please assist.
In the following, a cost function is given. Find the average cost per item 6destop and 2 notebook = 3 dvd free scheme 1

9desktop and 4 notebook = 6 dvd free scheme 2

i am having 98 desktop and 60 laptop which scheme will give me best output

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