Question 130879
C+W=400 OR C=400-W
.10C+.05W=22.50
.10(400-W)+.05W=22.50
40-.1W+.05W=22.50
-.05W=22.50-40
-.05W=-17.50
W=-17.50/-.05
W=350 WHITE COPIES.
400-350=50 WHITE COPIES.
PROOF
.10*50+.05*350=22.50
5+17.50=22.50
22.50=22.50