Question 112596
D+P=850 or D=850-P NOW SUBSTITUTE (850-P) FOR D IN THE FOLLOWING EQUATION & SOLVE FOR P
300D+225P=217,500
300(850-P)+225P=217,500
255,000-300P+225P=217,500 [THE 255,000 IS THE PRODUCT OF (300*850)]
-75P=217,500-255,000
-75P=-37,500
P=-37,500/-75
P=500 IS THE NUMBER OF PONDEROSA PINES BOUGHT.
850-500=350 IS THE NUMBER OF DOUGLAS FIRS BOUGHT.
PROOF
300*350+225*500=217,500
105,000+112,500=217,500
217,500=217,500