The books of school A are 50% of the books of school B, how much are the books of school B
甲校的图书是乙校图书的50%，乙校图书是甲校的多少
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

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

<result>2</result>