Guangming Primary School has a total of 650 students. The number of second grade students is 1/5 of the total number of students in the school, and the number of boys in second grade accounts for 7/13 of the number of second grade students. How many boys are there in second grade?
光明小学共有学生650人，二年级学生数是全校学生总数的(1/5)，二年级的男生人数占二年级学生数的(7/13)，二年级有男生多少人？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">7 / 13</gadget>
<output>7/13 = around 0.538462</output>

<gadget id="calculator">650 * (1/5) * (7/13)</gadget>
<output>70</output>

<result>70</result>