exam Maths Puzzle Numerical Ability

crystal sells coffee. her special blend is a combination of french roast @ $7.50 a lb. and kona deluxe @ $11.50 a lb. how many pounds of kona should she mix with 12 lbs. of french roast to get a blend to be sold for $10.00 a lb.?

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exam Other Question
What is the y-coordinate of the vertex of a parabola with the following equation?

y = x^2 - 6x + 14 Determine whether the statement is a tautology, self-contradiction or neither

(p ^ ~q) -> q