The current price of a commodity is reduced by (1/5) from the original price, which is 20 yuan. What is the original price? What is the correct column
一种商品现价比原价降低了(1/5)后是20元，求原价是多少？正确的列式是多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">20 / (4/5)</gadget>
<output>25</output>

<result>25</result>