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

how many ways can a dollar be used for ninety cents using quarters nickels and dimes? i need to solve this equation for x:
x^3+ 7.07x^2 + 2.72x -14.75=0
i tried factoring out an x and then applying the quadratic equation but it doesnt seem right please guide me in the right direction. thank you