There are 45 students in each of the three classes of Grade 6 in Xinming Primary School. There are (2/5) boys in Class 1, and the number of boys in Class 2 is the same as that of girls in Class 3. How many girls are there in Grade 6?
新明小学六年级三个班的人数都是45人，一班有(2/5)是男生，二班男生人数与三班女生人数同样多，六年级共有女生多少人．
<gadget id="calculator">2 / 5</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">45 * (3/5)</gadget>
<output>27</output>

<gadget id="calculator">27 + 45</gadget>
<output>72</output>

<result>72</result>