<PRE><B>Question 99107</B>
D+P=850 OR D=850-P
300D+225P=217500 NOW REPLACE D BY (850-P)
300(850-P)+225P=217500
255000-300P+225P=217500
-75P=217500-255000
-75P=-37500
P=-37500/-75
P=500 NUMBER OF PONDEROSA PINETREES SOLD.
D+500=850
D=850-500
D=350 NUMBER OF DOUGLAS TREES SOLD.
PROOF
300*350+500*225=217500
105000+112500=217500
217500=217500
</PRE>