There are 11.34 tons of grain in the canteen, 4.56 tons are eaten, and 5.45 tons are shipped in. How many tons of grain are there in the canteen?
食堂有粮食11.34吨，吃了4.56吨，又运来5.45吨，食堂现有多少吨粮食？
<gadget id="calculator">11.34 - 4.56</gadget>
<output>6.78</output>

<gadget id="calculator">6.78 + 5.45</gadget>
<output>12.23</output>

<result>12.23</result>