A store sold 2.8 tons of flour last week, less than rice (1/5). How many tons of rice did the grain store sell last week? (solution by equation)
某商店上周卖出面粉2.8吨，比大米少(1/5)．粮店上周卖出大米多少吨？(用方程解)
<gadget id="calculator">1 / 5</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">2.8 / (4/5)</gadget>
<output>3.5</output>

<result>3.5</result>