Question 36991
900X+1200(100-X)=1125*100 OR 900X+120000-1200X=112500 OR -300X=7500 OR X=25

OR 25 POUNDS OF 9$ COFFEE WITH 75 POUNDS OF $12 COFFEE MAKES 100 POUINDS OF 

$11.25 PER POUND COFFEE 

PROOF 900*25+1200(100-25)=1125*100 OR 22500+90000=112500 OR 112500=112500