Warehouse A and warehouse B have a total of 84 tons of cement. If 6 tons of cement are shipped from Warehouse A and put into Warehouse B, then the ratio of the quantity of cement in Warehouse A to Warehouse B is 4:3. How many tons of cement did Warehouse A originally have?
甲乙两仓库共有水泥84吨，如果从甲仓运出6吨水泥放入乙仓，那么甲仓和乙仓水泥数量的比是4：3，甲仓原来有水泥多少吨？
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