Question 59155
D+P=850 D=850-P
300D+225P=217500

300(850-P)+225P=217500
255000-300P+225P=217500
-75P=-37500
P=37500/75
P=500 PINE TREES
D+500=850
D=850-500
D=350   DOUGLASS FIR TREES
PROOF
300*350+225*500=217500
105000+112500=217500
217500=217500