bookstore is offering a 30% discount. Wang Jun bought a copy of "Encyclopedia for Juveniles" which is 6 yuan cheaper than the original price. How much is the original price of this book?
某书店打七折销售，王俊买了一本《少年百科全书》比原价便宜6元，这本书原价多少元？
<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">6 / (3/10)</gadget>
<output>20</output>

<result>20</result>