exam Maths Puzzle Numerical Ability

perfect square trinomial formula
y exponent 2 - 12y + 36=

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A candy store sells malted milk balls for $2.50 per pound, and chocolate-covered raisins for $3.75 per pound. How many pounds of each should be used to make a 10 pound mixture tha How many pounds of chocolate at $3 per pound and peanuts at $ per pound must be mixed to produce 30 pounds of a party mix worth $2.80 per pound?