exam Maths Puzzle Numerical Ability

3x+y=21
10x+5y=65

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25. solve for n if P(n,3)=2C(n,2),n � N It takes 150 square feet of wood flooring to cover a 13 by 11 foot room, counting waste. At this rate, how much flooring, to the nearest foot, would it take to cover a 15 by 20 foot room?