Warehouse A stores 108 tons of grain, and Warehouse B stores 140 tons of grain. If the grain stored in Warehouse A is three times that of Warehouse B, how many tons must be transported from Warehouse B to Warehouse A?
甲仓库存粮108吨，乙仓库存粮140吨，要使甲仓库的存粮是乙仓库的3倍，那么必须从乙仓库内运出多少吨放入甲仓库？
<gadget id="calculator">108 + 140</gadget>
<output>248</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">248 / 4</gadget>
<output>62</output>

<gadget id="calculator">140 - 62</gadget>
<output>78</output>

<result>78</result>