A farmer harvests 400 kilograms of rapeseed this year, which is 20% less than the harvested wheat. How many kilograms of wheat does his family harvest this year? (solution by equation)
一个农户今年收菜籽400千克，比收的小麦少20%，他家今年收小麦多少千克？(用方程解)
<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">400 / (4/5)</gadget>
<output>500</output>

<result>500</result>