A set of autumn clothes is 224 yuan after a 20% discount, of which the original price of the top is 180 yuan, so how much is the original price of the trousers?
一套秋装打完八折后是224元，其中上衣的原价是180元，那么裤子的原价是多少元？
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">180 * (4/5)</gadget>
<output>144</output>

<gadget id="calculator">224 - 144</gadget>
<output>80</output>

<gadget id="calculator">80 / (4/5)</gadget>
<output>100</output>

<result>100</result>