exam Maths Puzzle Numerical Ability

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

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exam Other Question
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? Identify the base in the statment "50% of 300 is 150."

I believe it is 50% am I correct?