Warehouse A stores 90 tons of grain, and Warehouse B stores 130 tons of grain. To make the amount of grain stored in Warehouse A three times that of Warehouse B, how many tons must be transported from Warehouse B to Warehouse A?
甲仓库存粮90吨，乙仓库存粮130吨，要使甲仓库存粮数是乙仓库的3倍，必须从乙仓库运出多少吨放入甲仓库？
<gadget id="calculator">90 + 130</gadget>
<output>220</output>

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

<gadget id="calculator">220 / 4</gadget>
<output>55</output>

<gadget id="calculator">130 - 55</gadget>
<output>75</output>

<result>75</result>