Mom bought a piece of clothing worth 180 yuan with 20% of the money. How much did my mother have?
妈妈用20%的钱买了一件180元的衣服，妈妈原来有多少元．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">180 / (1/5)</gadget>
<output>900</output>

<result>900</result>