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Maths Puzzle
Numerical Ability
If P=x+1/x-1 and Q=x-1/x+1, find P^2+Q^2-PQ.
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book Other Question
A coffee house has 20 lbs. of coffee that sells for $4 per pound. How many pounds of coffee that sells for $8 per pound should be mixed with the 20 pounds of $4 coffee to obtain a
1/2x-1/2=1/4x+3/2