(200+340)÷(1-40%)=540÷0.6=900kg答 运来900kg
X*40% +340+200=X0.6X=540X=900工900千克
60%=340+200 (千克)1%=54/6 (千克)100%=9x100 (千克)
(340+200)÷(1-40%)=900
(340+200)/(1-40%)=900 KG