There are 100 bags of rice in the warehouse, and 20 bags are transported away. How much is the remaining bag?
仓库有100袋大米，运走20袋，运走的占剩下的多少
<gadget id="calculator">100 - 20</gadget>
<output>80</output>

<gadget id="calculator">20 / 80</gadget>
<output>1/4 = around 0.25</output>

<result>1/4 = around 0.25</result>