設(shè)奶糖x 巧克力y
y/(x+y+10)=60%
(y+30)/(x+y+30)=75%
y/(x+y+10)=60%
y=0.6x+0.6y+6
0.4y=0.6x+6
2y=3x+30
(y+30)/(x+y+30)=75%
y+30=0.75x+0.75y+22.5
0.25y=0.75x-7.5
y=3x-30
2(3x-30)=3x+30
6x-60=3x+30
3x=30+60
x=30
y=3x30-30=60小學(xué)生不會(huì)二元一次方程，請(qǐng)用一元一次吧加10顆奶糖，巧克力占總數(shù)的60%，說(shuō)明此時(shí)奶糖占40%，巧克力是奶糖的60/40=1。5倍 再增加30顆巧克力，巧克力占75%，奶糖占25%，巧克力是奶糖的3倍增加了3-1.5=1.5倍，說(shuō)明30顆占1.5倍奶糖=30/1.5=20顆 巧克力=1.5*20=30顆奶糖=20-10=10顆