50x+40(1100-x)=50(1+10%)x+40(1-15%)(1100-x)

问题描述:

50x+40(1100-x)=50(1+10%)x+40(1-15%)(1100-x)

苍天啊

50x+40(1100-x)=50(1+10%)x+40(1-15%)(1100-x)
50x+44000-40x=55x+37400-34x
11x=6600
x=600