There are two warehouses, A and B. Warehouse A stores 5.2 tons of coal, and Warehouse B stores 7 tons of coal. If Warehouse A transports 0.36 tons per day and Warehouse B transports 0.51 tons per day, how many days later will the remaining coal in the two warehouses be equal?
甲、乙两个仓库，甲仓库存煤5.2吨，乙仓库存煤7吨．如果甲仓库每天运走0.36吨，乙仓库每天运走0.51吨，那么几天后两个仓库剩下的煤相等？
<gadget id="calculator">7 - 5.2</gadget>
<output>1.8</output>

<gadget id="calculator">0.51 - 0.36</gadget>
<output>0.15</output>

<gadget id="calculator">1.8 / 0.15</gadget>
<output>12</output>

<result>12</result>