After Zhang Jun took out (1/5) of his books to Li Ying, they both had the same number of books. Li Ying originally had 24 books, and how many books did Zhang Jun originally have.
张军拿出自己图书的(1/5)给李英后，两人图书本数就同样多，李英原来有图书24本，张军原来有图书多少本．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">24 / (3/5)</gadget>
<output>40</output>

<result>40</result>