Uncle Wang bought a set of "Encyclopedia for Juveniles" with a 10% discount at Xinxing Bookstore with his membership card, which is 6 yuan cheaper. What is the original price of this set of books?
王叔叔凭会员卡在新兴书店已九折购买了一套《少年百科全书》，便宜了6元，这套书原价多少．
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">1 - (9/10)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">6 / (1/10)</gadget>
<output>60</output>

<result>60</result>