A junior high school version of "New Hope Cup" National Mathematics Contest Real Question Analysis" sold at 60% of the original price (i.e. 40% off) will lose 6 yuan, and sell at the original price to make a profit of 11 yuan. So how much is the original price of this book? ?
一本初中版《"新希望杯"全国数学大赛真题解析》按原价的60%(即打6折)出售则亏6元，按原价出售可盈利11元，那么这本书原价是多少元呢？
<gadget id="calculator">6 + 11</gadget>
<output>17</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">1 - (3/5)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">17 / (2/5)</gadget>
<output>85/2 = around 42.5</output>

<result>85/2 = around 42.5</result>