The school cafeteria bought 1200 kilograms of rice and ate 30%, how many kilograms of rice are left?
学校食堂买来1200千克大米，吃了30%，还剩多少千克大米？
<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (3/10)</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1_200 * (7/10)</gadget>
<output>840</output>

<result>840</result>