A sweater is now priced at 51 yuan, which is a price reduction (3/20) from the original price. How much is the original price?
一件毛衣现在售价51元，比原来降价(3/20)，原来售价多少元．
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">1 - (3/20)</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">51 / (17/20)</gadget>
<output>60</output>

<result>60</result>