Due to poor management, a certain manufacturer sells products at a reduced price. The price of the schoolbag is 20 yuan lower than the original price (1/5). Please find the correct list of the original price of the schoolbag.
某厂家由于经营不善，降价出售商品，书包比原价降低(1/5)后是20元，求书包原价的正确列式多少．
<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>