When Qiqi calculated "40-□*2", he did the subtraction first and then the multiplication, and the result was 72. So what is the correct number for this question?
奇奇在计算"40-□*2"时，先算减法，后算乘法，结果得数是72．那么这道题的正确得数是多少．
<gadget id="calculator">72 / 2</gadget>
<output>36</output>

<gadget id="calculator">40 - 36</gadget>
<output>4</output>

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">40 - 8</gadget>
<output>32</output>

<result>32</result>