The original grain in warehouses A and B are 80 tons and 72 tons respectively. If the grain in warehouse A is three times that of warehouse B, how many tons must be transported from warehouse B to warehouse A?
甲、乙两仓库原有粮食分别是80吨、72吨，要使甲仓库粮食是乙仓库的3倍，那么必须从乙仓库内运出多少吨放入甲仓库？
<gadget id="calculator">80 + 72</gadget>
<output>152</output>

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

<gadget id="calculator">152 / 4</gadget>
<output>38</output>

<gadget id="calculator">72 - 38</gadget>
<output>34</output>

<result>34</result>