Xiao Min's family bought a bag of flour and ate 20 kilograms, which happened to be the bag of flour (4/5). How many kilograms are left in this bag of flour?
小敏家买来一袋面粉，吃了20千克，正好是这袋面粉的(4/5)．这袋面粉还剩多少千克？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<gadget id="calculator">25 - 20</gadget>
<output>5</output>

<result>5</result>