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例1甲、乙两个仓库原来保存的粮食袋数相等,后来从甲仓库调出80袋粮食放入乙仓库,又从外面运来120袋粮食也放入乙仓库,这时乙仓库的存粮是甲仓库的3倍。求原来甲、乙两仓库各存粮多少袋。解析先根据题意画出线段图。观察线段图,可知乙仓库运进粮食120袋后,乙仓库比甲仓库多存粮80×2+120=280袋。将甲仓库后来的存粮看成1份,则乙仓库比甲仓库多出来的粮食就是2份,即甲仓库后来的存粮为280÷2=140袋。
Example 1 A, B two warehouses originally stored the same number of food bags, and later transferred from A warehouse 80 bags of food into the B warehouse, and from the outside to bring 120 bags of food into the B warehouse, then B warehouse storage A warehouse is 3 times. Seek the original A, B two warehouses, the number of bags of grain. Parse according to the original idea to draw line drawings. Observe the line diagram, we can see B warehouse into the food after 120 bags, B warehouse more than grain storage 80 × 2 +120 = 280 bags. A warehouse will be later stored grain as a copy, then B warehouse more than the grain out of the food is 2 copies, namely A warehouse later saved grain 280 ÷ 2 = 140 bags.