There are 100 bags of flour in the warehouse of the grain store, and 20 bags are sold, how much are the remaining bags sold?
粮店仓库里有100袋面粉，卖出20袋，卖出的占剩下的多少
<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>