A and B warehouses store 760 tons of grain. It is known that warehouse A stores 480 tons of grain, and warehouse B stores 250 tons less grain than warehouse C. How many tons of grain does C warehouse store?
甲、乙两仓存粮食760吨，已知甲仓存粮480吨，乙仓比丙仓少存250吨，丙仓存粮多少吨？
<gadget id="calculator">760 - 480</gadget>
<output>280</output>

<gadget id="calculator">280 + 250</gadget>
<output>530</output>

<result>530</result>