There were some rice in the supermarket, 28 bags were sold, and 25 bags were shipped in. Now there are still 51 bags. How many bags of rice did the supermarket have?
超市原有一些大米，卖出28袋，又运进25袋，现在还有51袋，超市原有大米多少袋？
<gadget id="calculator">51 - 25</gadget>
<output>26</output>

<gadget id="calculator">26 + 28</gadget>
<output>54</output>

<result>54</result>