The supermarket originally had 4,500 kilograms of rice. After buying 3,000 kilograms, another 1,200 kilograms were shipped. How many kilograms of rice are there now?
超市原有4500千克大米，买掉3000千克后，又运来1200千克，现在有多少千克大米？
<gadget id="calculator">4_500 - 3_000</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 + 1_200</gadget>
<output>2_700</output>

<result>2_700</result>