Fangfang has 30 books, 50% less than Xiao Rong, how many books does Xiao Rong have? What is the correct column
芳芳有30本书，比小荣少50%，小荣有多少本？正确列式是多少
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 - (1/2)</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 / (1/2)</gadget>
<output>60</output>

<result>60</result>