A pair of shoes is 60 yuan after a 20% discount. How much is this pair of shoes?
一双鞋打八折后是60元，这双鞋原来多少元．
<gadget id="calculator">80 / 100</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">60 / (4/5)</gadget>
<output>75</output>

<result>75</result>