There are 63 students in Class 6 and 2 of Baimajing Experimental Primary School. The ratio of male to female students is 3:4. How many boys are there in this class?
白马井实验小学六2班共有学生63人，男女生人数的比是3：4，这个班的男生有多少人？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">63 * (3/7)</gadget>
<output>27</output>

<result>27</result>