On weekends, the teacher assigned some special exercises for oral calculations. Xiao Ming did all the homework on Friday night (1/4), and did all the homework on Saturday night (1/3). How many crossing calculation exercises are arranged in total?
周末，老师布置了一些口算专项练习题，小明星期五晚上做了全部作业的(1/4)，星期六晚上做了全部作业的(1/3)，这时还有40道口算题没做，老师共布置多少道口算练习题？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 - (1/4) - (1/3)</gadget>
<output>5/12 = around 0.416667</output>

<gadget id="calculator">40 / (5/12)</gadget>
<output>96</output>

<result>96</result>