There are two warehouses, A and B. The first warehouse has 260 tons of grain in storage, and the second warehouse has 50 tons of grain less than twice that of the first warehouse. How many tons of grain does the second warehouse have?
有甲乙两个仓库，第一仓库有存粮260吨，第二仓库的存粮比第一仓库的2倍少50吨，第二仓库存粮有多少吨？
<gadget id="calculator">260 * 2</gadget>
<output>520</output>

<gadget id="calculator">520 - 50</gadget>
<output>470</output>

<result>470</result>