大米:面粉=6:
运进大米有6x千克,运进面粉有7x千克:
(1-1/5)*6x+3960=7x
x=1800
6x=10800(千克)
运进大米10800千克.要方程的过程(1-1/5)*6x+3960=7x(4/5)*6x+3960=7x5*(4/5)*6x+5*3960=5*7x24x+5*3960=35x35x-24x=5*396011x=5*3960x=5*3960/11=5*360=18006x=10800(千克)