40% of a bag of chemical fertilizer is used, and the rest is 10 kg more than what was used. How much does this bag of chemical fertilizer weigh?
一袋化肥用去40%，剩下的比用去的多10千克，这袋化肥原来重多少千克？
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">10 / (1/5)</gadget>
<output>50</output>

<result>50</result>