There are 84 girls in the upper grades of a certain school. When rehearsing group exercises, 60 girls are selected from the girls, and (2/3) are selected from the boys. At this time, the remaining boys and girls are equal in number. How many boys are there in the upper grades of this school? people?
某校高年级有女生84人，排练团体操时，从女生中抽选出60名，从男生中抽选了(2/3)，这时余下的男生女生人数相等，这个学校高年级有男生多少人？
<gadget id="calculator">84 - 60</gadget>
<output>24</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">1 - (2/3)</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">24 / (1/3)</gadget>
<output>72</output>

<result>72</result>