Hope Primary School has 648 students, of which the sixth grade students account for (1/6) of the total number, and (5/9) of the sixth grade students are boys. How many sixth grade boys are there?
希望小学有学生648人，其中六年级学生人数占总人数的(1/6)，而六年级学生中的(5/9)是男生．六年级男生有多少人？
<gadget id="calculator">1 / 6</gadget>
<output>1/6 = around 0.166667</output>

<gadget id="calculator">5 / 9</gadget>
<output>5/9 = around 0.555556</output>

<gadget id="calculator">648 * (1/6) * (5/9)</gadget>
<output>60</output>

<result>60</result>