exam Maths Puzzle Numerical Ability

If you bought 850 Douglas firs and ponderosa pines and paid an average of $300 for douglas firs and $225 for ponderosa pines and the total you spent was $217,500 how many of each tree did you buy?

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exam Other Question
Factor the polynomial.

81 a 8 b 8 c 6 - 16 d 8 how would i solve these using factoring :D .

1- (x - 2)(2x - 5) = 0


2- x^2 + 6x - 27 = 0


3- x^2 + 6 = -5x