Question 130101
24x+18(40-x)=22.50*40
24x+720-18x=900
6x=900-720
6x=180
x=180/6
x=30 kg of $24 coffee is needed.
40-30=10 kg of $18 coffee is needed.
proof
24*30=18*10=900
720+180=900
900=900