After 20% of a bag of chemical fertilizer is used up, 4 kg is added, and the weight at this time is equivalent to (5/6) of the original weight. How much does this bag of chemical fertilizer weigh now?
一袋化肥用去20%后，再加进去4千克，这时的重量相当于原重量的(5/6)，现在这袋化肥重多少千克？
<gadget id="calculator">5 / 6</gadget>
<output>5/6 = around 0.833333</output>

<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">(5/6) - (4/5)</gadget>
<output>1/30 = around 0.033333</output>

<gadget id="calculator">4 / (1/30)</gadget>
<output>120</output>

<gadget id="calculator">120 * (5/6)</gadget>
<output>100</output>

<result>100</result>