exam Maths Puzzle Numerical Ability

sinx + cosx - sinxcosx = sin^2 x + cos^2 x

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Factor completely. ax - ay + x^2 - xy 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