设甲袋原来有y个球;乙袋原来有(90-y)个球;
3/5y=3/4(90-y)
3/5y=3/4×90-3/4y
3/5y+3/4y=67.5
0.6y+0.75y=67.5
1.35y=67.5
y=67.5÷1.35
y=50
乙袋原来有90-50=40(个);
答:甲袋原来有50个;乙袋原来有40个;
设甲袋原来有y个球;乙袋原来有(90-y)个球;
3/5y=3/4(90-y)
3/5y=3/4×90-3/4y
3/5y+3/4y=67.5
0.6y+0.75y=67.5
1.35y=67.5
y=67.5÷1.35
y=50
乙袋原来有90-50=40(个);
答:甲袋原来有50个;乙袋原来有40个;