After 50% off a schoolbag, 20 yuan was saved. What is the original price of this schoolbag?
把一个书包打九五折后，省了20元，这个书包原价多少元．
<gadget id="calculator">95 / 100</gadget>
<output>19/20 = around 0.95</output>

<gadget id="calculator">1 - (19/20)</gadget>
<output>1/20 = around 0.05</output>

<gadget id="calculator">20 / (1/20)</gadget>
<output>400</output>

<result>400</result>