book Maths Puzzle Numerical Ability

(-2/3)+p=1/6

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FIND THE COST PER UNIT DURING A WEEK WHEN THE TOTAL COST WAS 68,000, THE NUMBER OF UNITS PRODUCED WAS 500, AND THE FIXED COSTS WERE 8000. USE THE FORMULA T=U TIMES N+F, WHERE T IS how do u do 2 1/4 + (-4)?