The fruit grower harvested 500 tons of bananas, and the remaining bananas were 50 tons more than half of the ones already sold. What fraction is left?
果农收获香蕉500吨，剩下的比已经卖出的一半还多50吨，还剩下几分之几？
<gadget id="calculator">500 - 50</gadget>
<output>450</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">450 / (3/2)</gadget>
<output>300</output>

<gadget id="calculator">500 - 300</gadget>
<output>200</output>

<gadget id="calculator">200 / 500</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>