After eating 30% of 300 kg of flour and eating the remaining 70%, how many kg are left?
300千克的面粉吃了30%后，又吃了余下的70%，还剩下多少千克？
<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">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">300 * (7/10) * (3/10)</gadget>
<output>63</output>

<result>63</result>