exam Maths Puzzle Numerical Ability

What is the algebraic property that proves:

If A = B/C then C = B/A

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exam Other Question

The profit on a watch is given by P = X2 - 13 X - 80, where X is the number of watches sold per day. How many watches were sold on a day when there was a $50 loss? Maureen paid $62.06 including 7% tax, for a sweater. How much did the sweater itself cost?