There are some books in the middle class of the kindergarten, and more than half of the books are given to the small class. There are 40 books left. How many books are there in the middle class?
幼儿园中班有一些书，把书的一半多四本送给小班，还剩40本，中班原有多少本书？
<gadget id="calculator">40 + 4</gadget>
<output>44</output>

<gadget id="calculator">1 / 2</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">44 / (1/2)</gadget>
<output>88</output>

<result>88</result>