After eating 20% of 250 kilograms of rice, and eating the remaining 20%, how many kilograms of rice are left
250千克大米吃去20%后，又吃了余下的20%，还剩大米多少千克
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">250 * (4/5) * (4/5)</gadget>
<output>160</output>

<result>160</result>