Two grain depots, A and B, each originally stored a whole bag of grain. If 90 bags are transferred from depot A to depot B, the number of bags of grain stored in depot B is twice that of depot A. If several bags are transferred from grain depot B to grain depot A, the number of bags of grain in grain depot A is 6 times that of grain depot B. So how many bags of grain does A grain depot originally store at least?
甲、乙两个粮库原来各存有整袋的粮食，如果从甲粮库调90袋到乙粮库，则乙粮库存粮的袋数是甲粮库的2倍．如果从乙粮库调若干袋到甲粮库，则甲粮库存粮的袋数是乙粮库的6倍．那么甲粮库原来最少存有多少袋粮食．
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