20% of 200 kg of coal is used first, and then the remaining 25%, how many kg of coal are used in two times.
200千克煤先用去20%，又用去剩下的25%，两次一共用去多少千克煤．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">200 * (1/5)</gadget>
<output>40</output>

<gadget id="calculator">200 - 40</gadget>
<output>160</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">160 * (1/4)</gadget>
<output>40</output>

<gadget id="calculator">40 + 40</gadget>
<output>80</output>

<result>80</result>