kind of schoolbag is sold at 30% off, and each is 15 yuan cheaper than the original price. How much is the original price of each schoolbag?
一种书包七折销售，每个比原价便宜了15元，这种书包每个原价多少元？
<gadget id="calculator">70 / 100</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">1 - (7/10)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">15 / (3/10)</gadget>
<output>50</output>

<result>50</result>