There are 150 students in 3 classes in the first grade of the school, and the number of students in each class is equal. It is known that the number of boys in Class 1 is equal to the number of girls in Class 2, and the number of boys in Class 3 is girls (2/3). How many boys are there in Grade 1?
学校一年级3个班共有150人，每个班人数相等．已知一班的男生人数与二班的女生人数相等，三班的男生是女生的(2/3)，一年级共有男生多少人？
<gadget id="calculator">150 / 3</gadget>
<output>50</output>

<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">50 * (2/5)</gadget>
<output>20</output>

<gadget id="calculator">50 + 20</gadget>
<output>70</output>

<result>70</result>