The canteen bought 450 kilograms of flour, which was 20% less than the rice bought. How many kilograms of rice were bought?
食堂买来面粉450千克，比买来的大米少20%，买来大米多少千克？
<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">450 / (4/5)</gadget>
<output>1_125/2 = around 562.5</output>

<result>1_125/2 = around 562.5</result>