There are 50 students in each of the three classes of the sixth grade in a certain school. Among them, there are (2/5) girls in the first class, and the number of boys in the second class is the same as the number of girls in the third class. How many boys are there in the sixth grade in this school?
某校六年级三个班的人数都是50人，其中一班有(2/5)是女生，二班的男生人数与三班的女生人数一样多，该校六年级共有男生多少人？
<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">50 * (3/5)</gadget>
<output>30</output>

<gadget id="calculator">50 + 30</gadget>
<output>80</output>

<result>80</result>