exam Maths Puzzle Numerical Ability

THERE ARE 850 DOUGLAS FIR AND PONDEROSA PINE TREES IN A SECTION OF FOREST BOUGHT BY LOGGING COMPANY. THE COMPANY PAID AN AVERAGE OF $300 FOR EACH DOUGLAS FIR AND $225 FOR EACH PON

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Solve 3x(to the 3rd)+7x(squared)-22x-8=0, given that negative one third is a solution. LN=x and Mp=2x-4