A sweater is now priced at 51 yuan, 15% lower than the original price. How much was the original price?
一件毛衣现在售价51元，比原来降价15%．原来售价多少元？
<gadget id="calculator">15 / 100</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>