设butterscotch需x磅,则cinnamon balls需20-x磅
3.40x+2.90(20-x)=3.00*20
34x+29(20-x)=600
34x+580-29x=600
34x-29x=600-580
5x=20
x=4
20-4=16(pounds)
设butterscotch需x磅,则cinnamon balls需20-x磅
3.40x+2.90(20-x)=3.00*20
34x+29(20-x)=600
34x+580-29x=600
34x-29x=600-580
5x=20
x=4
20-4=16(pounds)