The first warehouse stores 250 tons of grain, and the second warehouse stores 30 tons more grain than the first warehouse. How many tons of grain are stored in the two warehouses?
第一仓库存粮250吨，第二仓库存粮比第一仓库的2倍还多30吨，两个仓库共存粮多少吨？
<gadget id="calculator">250 * 2</gadget>
<output>500</output>

<gadget id="calculator">500 + 30</gadget>
<output>530</output>

<gadget id="calculator">250 + 530</gadget>
<output>780</output>

<result>780</result>