设原来甲仓库存粮x吨,则乙仓库存粮x/(1-25%)=4/3 x吨,4/3 x-15=x+15解得,1/3 x=30x=90
甲乙比1:1.25=100:125=4:5总数15*2/(5/9-4/9)=270吨甲原来有270*4/9=120吨
设甲为x吨x+15=x/75%-15解得:x=90