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
1)2x-5/(x-2)(x+6)over/divided by x^-2x+1/(x-2)(x+6)=?

2)4ab*b*b*b*b/a+b/6a^b*b*b*b=? An alloy of tin is 16% tin. How much tin must be added to make 820 lbs of alloy that is 18% tin? Answer to the nearest tenth.