A kind of schoolbag is discounted by 15%, saving 6 yuan, ask for the original price of the schoolbag.
一种书包打八五折后，省了6元钱，求书包原价．
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">6 / (3/20)</gadget>
<output>40</output>

<result>40</result>